Malicious PDF — malware analysis report

Static analysis result for SHA-256 f862abdf44734027…

MALICIOUS

PDF

79.0 KB Created: 2021-03-17 10:48:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c8d21993aa072b395d6ea27948814721 SHA-1: b04fa2c12b07ee077e96eed292e5e5a70b472ad6 SHA-256: f862abdf447340272e233b2981a152fd5c38ac421206717e328a0206d2eccacc
196 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 as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which point to SEO redirectors like 'https://jottigo.ru/strik?utm_term=how+to+configure+dd-wrt+router+as+a+repeater'. The document body, though heavily obfuscated, appears to be a lure related to router configuration. The presence of numerous external links suggests an attempt to drive traffic to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://jottigo.ru/strik?utm_term=how+to+configure+dd-wrt+router+as+a+repeater PDF link annotation
    • https://cdn.sqhk.co/panafilaputu/hjjaigi/gold_boots_outfit.pdfIn PDF document text
    • https://cdn.sqhk.co/rifarako/OjiozqL/66352351461.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/hjjf4JO/download_standoff_2_mod_apk_obb.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/AIGuAia/9054643906.pdfIn PDF document text
    • https://cdn.sqhk.co/gutinisiv/BPibgei/football_betting_strategy_soccer_tips.pdfIn PDF document text
    • https://cdn.sqhk.co/gulifunanale/egegeja/yellow_neon_sign_black_background.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee81a7c5-e4ab-4b44-8d2b-7053c08f38e8/56262148399.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6759a1cf-3c59-46c1-b911-b2928a87f7a0/xudanid.pdfIn PDF document text
    • https://09972071-4174-499b-90b1-de3619f59f53.filesusr.com/ugd/d1c05f_39e49917e087497891a29558a21e89dc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d484daf5-b71b-4170-9990-807e71baf9ee/1996_jeep_cherokee_xj_fuel_pump.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d7d963d-62a7-4e2b-ba48-8cc79a55579d/schwinn_spin_bike_ic3_amazon.pdfIn PDF document text
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_d2cecc4bd3314951a252a2f9aa418a76.pdf?index=trueIn PDF document text
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_f724303264854582aaf2646a4d5af653.pdf?index=trueIn PDF document text
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_fee3cf90c7364c96a4d31390a85699ac.pdf?index=trueIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_4256865b8ee343eca70030c236a6f0e9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b56ce97-6ed2-44e6-8df1-791a952e63a6/5583940849.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/843cf176-936b-4662-8447-6d842d9dc0d7/android_phone_development_board.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c503b69a-5e1f-4e80-aff3-6c7e0230926c/hp_officejet_7310_wireless_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/259ed15e-3de9-4a13-8b5e-c3df05e1504d/samidasomedizumexufe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9b56053-452f-4caa-9616-11e051646852/xaxezimesigewufibabas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c221932b-d20f-457b-843d-8afd8cdb1cd2/maytag_quiet_series_300_dishwasher_buttons_not_working.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE110 5376 bytes
SHA-256: 1969b9d46983614153b1d6535fd680acb3f4eb25fbee501ef58634a0ca760c97
font_01_sfnt_off0000f387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF387 10348 bytes
SHA-256: 847af3b29a696f95ab30153f555c41a9d28586d32726f87df33de14666bb0def
font_02_sfnt_off0001172f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172F 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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