Malicious PDF — malware analysis report

Static analysis result for SHA-256 9433fc5cb5081e89…

MALICIOUS

PDF

83.3 KB Created: 2021-03-19 15:54:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f9ed841410f316df47765e517ee02792 SHA-1: b7d358e15076b2024161ac3b7b434597df725a67 SHA-256: 9433fc5cb5081e895bcb542ab5466ddc95bde068c8ab773a9dba822ddcd710d3
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a link to a known malicious redirector and a large number of SEO-linked PDFs. The ML classifier also strongly indicated maliciousness. The primary malicious link identified is https://yafferge.ru/123?utm_term=pictoword+game+answers, which likely leads to a phishing or malware distribution site. No scripts were extracted, but the PDF structure itself contains malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/123?utm_term=pictoword+game+answers In PDF document text
    • https://cdn.sqhk.co/nawamuzimosu/hacfgfG/genetics_practice_problems_3_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/fimegasaz/gg12lhU/alligator_snapping_turtle_lifespan.pdfIn PDF document text
    • https://cdn.sqhk.co/munenetifu/dOqhi3g/mawoguzodumugowusoxujewel.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/ijjahdZ/tuvotixevafu.pdfIn PDF document text
    • https://cdn.sqhk.co/zuzememub/gjgMKT5/38203121034.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/befafuni/how_to_make_report_writing_samples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c26455e-c7ad-4fb3-b3b2-5a717ff25917/wulitafilewojizowelaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/725afcc4-5f9a-4503-93a7-e37a77695407/the_fifth_wave_book_plot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56984a47-02ed-4fc4-9add-65bc6fb5d0d0/74852109884.pdfIn PDF document text
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_fbd5e252333649148450c32314b1d4a0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/451a95aa-c466-46cf-9ef1-e07c32f04d90/story_of_your_life_ted_chiang_audiobook.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/baking_parchment_paper_sheets.pdfIn PDF document text
    • https://09972071-4174-499b-90b1-de3619f59f53.filesusr.com/ugd/d1c05f_803ca6a6afec4699b9a88bf0c6493aef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/remeranexe/uterine_artery_doppler_waveform.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c50327d-3f1e-4c5e-8211-5f89ffe98bfd/satun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b150bac-4d77-48be-96db-0ef3aee8f066/cuales_son_los_dolores_mas_comunes_en_el_embarazo.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/disneyland_paris_tourist_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/is_there_a_percy_jackson_and_the_battle_of_the_labyrinth_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/869d8bcb-c8e8-4410-a533-afdb00b66c5e/22118084970.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/xukoxoxepekalorazif.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/league_of_legends_item_building_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d76fcfc-e68e-45ce-9b32-fb712f89298e/how_to_connect_hp_officejet_j4680_all_in_one.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/nikon_p-223_3-9x40_mate_bdc_600_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3d20c96-98a1-441c-a5f7-c034bc75e90f/what_coffee_did_juan_valdez_represent.pdfIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_3dc32fa60aaa4fda8054d8283b4c7141.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D1 5320 bytes
SHA-256: 207be3e6b86ba93358843b9cd79776843528b979048ba5e4cd75a2e64394e03b
font_01_sfnt_off000118e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E2 11404 bytes
SHA-256: b6766efdeff5fdd99b973ce02f2b4c80d49a450df88377e2d7fb1fef674322c4

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