Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a64f85935c0784…

MALICIOUS

PDF

70.3 KB Created: 2021-04-08 01:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 79cf32fe15323d98c1241da971544c5d SHA-1: c819250587f349acf91fa0dcb6e3b588c436ae0a SHA-256: 33a64f85935c0784325b83c6d85c28a2925ade3a876ef29b483d7fee19f9fd2a
244 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating it is likely a phishing or spam distribution document. The presence of numerous external links, including one pointing to known malicious redirector infrastructure, suggests the primary goal is to lure users to potentially harmful websites. No scripts were extracted, but the document's structure and link farm characteristics are consistent with SEO poisoning tactics to drive traffic to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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.
  • 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://dafemum.ru/123?utm_term=natural+logarithms+worksheet+pdf In PDF document text
    • http://sayfelengs.space/100_aos_de_soledad_resumen_capitulo_17us2tz.pdfIn PDF document text
    • http://proflist-briansk.ru/jojevunjnd66.pdfIn PDF document text
    • https://rutobugexamaxip.weebly.com/uploads/1/3/4/5/134508198/sixuja.pdfIn PDF document text
    • https://jogofevizu.weebly.com/uploads/1/3/4/3/134348232/6427338.pdfIn PDF document text
    • https://zajebujop.weebly.com/uploads/1/3/4/9/134902249/nibadefewusemakuvik.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/H3Vhbhg/air_attack_2_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/rejoxapuzopa/8jfghAh/zezujuwalejilagab.pdfIn PDF document text
    • https://buzowupe.weebly.com/uploads/1/3/1/4/131483044/db3db985.pdfIn PDF document text
    • https://cdn.sqhk.co/logubaxe/NjaScgi/afk_arena_best_heroes_mid_game.pdfIn PDF document text
    • https://dituvilabo.weebly.com/uploads/1/3/4/8/134897320/451f4fa8ed392c1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://famuruvif.epizy.com/ansys_workbench_practice_problems.pdfIn PDF document text
    • http://bujazux.rf.gd/7191613959.pdfIn PDF document text
    • https://4ef57e19-9a2e-4e6f-a444-f6b59f982a39.filesusr.com/ugd/4c1554_03514714a24440ab8233df63d83c1206.pdf?index=trueIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_63171e64ba554865a96b0335029f549b.pdf?index=trueIn PDF document text
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_671af772c5ca44d495c177904ca71c7a.pdf?index=trueIn PDF document text
    • http://guvodakar.epizy.com/bell_bottom_film_audio_song.pdfIn PDF document text
    • https://c8f6a2ed-bc8a-4fd4-b26a-19707db7c4cd.filesusr.com/ugd/1cc7e8_1943d653ee4c4bbe925da1aed430403d.pdf?index=trueIn PDF document text
    • https://4868a29a-6d77-448d-a9c5-bc5c6a1713c3.filesusr.com/ugd/060e50_9d54976a0b7e49e3851a9c29b151ec11.pdf?index=trueIn PDF document text
    • https://82cb18f6-4a40-4824-ac11-10070f72ce02.filesusr.com/ugd/5aec95_ea9705c6de644c59b061944103d147be.pdf?index=trueIn PDF document text
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_34db0ab865564f36b293655d47b4e740.pdf?index=trueIn PDF document text
    • http://jezepanan.rf.gd/practical_palmistry_narayan_dutt_shrimali_download.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F7 5580 bytes
SHA-256: 5d8ba367a5158c20a39575baffba79ea4e74c9bf072b63eabee996449dae1c5e
font_01_sfnt_off0000e6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E0 10892 bytes
SHA-256: 1bbbafcdcc8a80f595eff13e24bfe71d3a88a29b8c0a6fae59b156622b8b2c7f

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