Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e2102a7f6e1ce0a…

MALICIOUS

PDF

163.1 KB Created: 2021-03-14 11:39:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 04345402f31356c72337a675b1231019 SHA-1: 7e092e3ead538a4749e433ea01055a2cd5ce4e4f SHA-256: 5e2102a7f6e1ce0a995351aca4b1cc598f7f554eecda6e885a474ffba02bc776
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The document body, though truncated and obfuscated, appears to be a search result for 'Interpreting a food web worksheet answers aurum science', likely a pretext to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/wix?keyword=interpreting+a+food+web+worksheet+answers+aurum+science PDF link annotation
    • http://wisecredit.info/79963919706v1a3g.pdfIn PDF document text
    • http://twoup-viktoria.online/suwebaz9dh7e.pdfIn PDF document text
    • https://cdn.sqhk.co/bexoninodag/eiaifja/domuxutifevudonesudog.pdfIn PDF document text
    • http://bumululoru.mywebcommunity.org/light_reflection_and_refraction_class_10_notes.pdfIn PDF document text
    • https://cdn.sqhk.co/mebinolopuf/MYjdihK/wuzasupenulozenupuf.pdfIn PDF document text
    • http://goodsun.fun/464422203094wov2.pdfIn PDF document text
    • https://cdn.sqhk.co/rogevuzazi/7ibTApq/ringtones_free_for_android_mobile_phones.pdfIn PDF document text
    • http://xutefizil.getenjoyment.net/64880881725.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xenezipulugiji.atwebpages.com/25394385871.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce349363-48b8-4a35-80b8-17ac82f4c0c8/is_reward_better_than_punishment.pdfIn PDF document text
    • https://2a6c20f5-091f-48b5-a5be-bf749919b1f6.filesusr.com/ugd/3794ad_392b2ba6eebe4c6ba632d626c2ef456a.pdf?index=trueIn PDF document text
    • https://1c896d37-30d1-4b4d-9537-98f963aae812.filesusr.com/ugd/865d50_1b145615f2f94ef78e9d74024a57f343.pdf?index=trueIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_580d2e57154e4b8eab92917f87a1adbf.pdf?index=trueIn PDF document text
    • https://4c80ca50-31de-4e6f-b265-471620011c4a.filesusr.com/ugd/08c6b7_058f3bf2f511452289cb414f1bb32c8b.pdf?index=trueIn PDF document text
    • https://9c50f6df-e9c1-453e-a208-eff1cefe231f.filesusr.com/ugd/44b3dc_ca20223a36284ba3a166fd4113fc40df.pdf?index=trueIn PDF document text
    • https://ef4b221f-cfb4-47e8-bf1d-3b5092770df7.filesusr.com/ugd/4948da_b05a0ace8018407d94872fb4f12c7e4d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bb44e1d-4d60-49c2-80c4-bb4cca0460f1/what_is_the_best_make_of_chest_freezer.pdfIn PDF document text
    • https://d0fd22f1-78bd-4368-960d-2a324028b2bb.filesusr.com/ugd/a4d998_ed57d67505ed4cff9c0401d27a450ebb.pdf?index=trueIn PDF document text
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_aa4870f10fa748d48f2f1e1c05092dce.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_off0002438d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2438D 5768 bytes
SHA-256: 331c8835a2c840bb8f8f27807e5eb2e643746fd8daa9cd5a6110cb3ed9506a98
font_01_sfnt_off00025726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25726 11288 bytes
SHA-256: 793f23335aead5edd3fad31e338950c45b725f85ffc50d017feb6a7946266310

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