Malicious PDF — malware analysis report

Static analysis result for SHA-256 db2f3f583f9cb522…

MALICIOUS

PDF

76.3 KB Created: 2021-04-02 20:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: eb3858f211f4c6254e555048abaf6194 SHA-1: bcb6a820cb06a8b92f2ce3785fff9fbcf5ea4c51 SHA-256: db2f3f583f9cb5229bd34e3dfe99b07cd1f5790477404ba1fef8c9c72e57f6f2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the embedded URIs, 'https://crophysi.ru/strik?utm_term=can+you+start+english+ivy+from+cuttings', is a primary indicator of malicious intent, likely serving as a redirector to malicious content or phishing pages. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/strik?utm_term=can+you+start+english+ivy+from+cuttings PDF link annotation
    • https://cdn.sqhk.co/tiwoxebu/jdijhjf/ninja_warrior_trampoline_park_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/doxinotilid/bgjrSUj/2669136848.pdfIn PDF document text
    • https://cdn.sqhk.co/lesasafo/fhibYKy/zeveja.pdfIn PDF document text
    • http://medebupima.sportsontheweb.net/rejukided.pdfIn PDF document text
    • https://cdn.sqhk.co/jotapepikota/hcijPhi/57581469474.pdfIn PDF document text
    • https://cdn.sqhk.co/vemegunir/Thhjbih/street_machine_drag_challenge_weekend_2019.pdfIn PDF document text
    • http://gazagidumow.mygamesonline.org/23947049785.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/544838b8-51f6-410f-ab73-ff86e1b8f86d/biddeford_electric_blanket_controller_replacement.pdfIn PDF document text
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_540d72c7b7a04f6397e60a25c8f3801c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7f77264-970b-4425-83df-abae3ec8bca6/countable_and_uncountable_nouns_7_esl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a0720f4-0a95-49af-9baf-5dee969776ab/what_is_the_best_price_for_an_ipad_mini.pdfIn PDF document text
    • https://68f06c25-eb64-4e0a-94e3-a0e33e610147.filesusr.com/ugd/463ace_b88a42f98c2f4a5d839b1be01f037a14.pdf?index=trueIn PDF document text
    • https://d7179dab-c972-4501-9f4a-16044ca71e84.filesusr.com/ugd/434f74_8bccbb46d06f459caf525028835cd803.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6ef8706-4272-435b-bce6-8083db6c2da5/dell_inspiron_n5010_i5_laptop_price_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a3ae1a3-bb7a-4dde-8604-f912b8945c90/nazm_hikmetin_iirlerini_gster.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d63dc87e-6d9f-46de-b393-3b3532229e83/will_gta_6_work_on_ps4.pdfIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_77b5d423a3f4408a8c4c0e2a89f0f870.pdf?index=trueIn PDF document text
    • https://1ceef7f3-d523-4f80-a0a4-3aed54d3d17a.filesusr.com/ugd/48841a_b2931b374ceb44838bf098231c5abe69.pdf?index=trueIn PDF document text
    • https://161abad2-7de2-49bb-9904-d6e2a620a662.filesusr.com/ugd/2eec94_59439ea4e430452996af7b4436847a7d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/edcc9568-638c-4f02-a49a-451fd311847a/now_behold_the_lamb_chords.pdfIn PDF document text
    • https://dd67658a-cc17-4e1c-bca5-42bf299a485b.filesusr.com/ugd/07a440_ab95b29d328a4f7da1db860cb02058fb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE6 5364 bytes
SHA-256: c3b639d6631a5e36c397827212b0ddd0e4f8d63d8d1d237fc682471024f527c2
font_01_sfnt_off0000f211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF211 10344 bytes
SHA-256: 355848efe0ac90177c879feae0406fa700f86fa34c3b821b541226efef5433a5
font_02_sfnt_off00011574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11574 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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