Malicious PDF — malware analysis report

Static analysis result for SHA-256 61cb7268fecd4968…

MALICIOUS

PDF

85.9 KB Created: 2021-03-05 15:41:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 99bf2acd5fd236986ee8859f3830b1e9 SHA-1: d673b6398992b4c9659f415776661b02fe0c9652 SHA-256: 61cb7268fecd49680852bd1a9bea2d6306488a55947bad5d730368fbf28c0e98
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm for SEO manipulation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the structure and heuristics point to a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://golowaki.ru/wix?keyword=chinese+zodiac+printables PDF link annotation
    • https://cdn.sqhk.co/godezixibufo/R7JKjek/86657868608.pdfIn PDF document text
    • https://cdn.sqhk.co/mimufedu/Vljffii/doordash_login_driver.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487386/normal_5fdba7f469355.pdfIn PDF document text
    • https://dofolemabumef.weebly.com/uploads/1/3/4/4/134458616/d4c52db533f68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426679/normal_5fd6c6e9bdf8b.pdfIn PDF document text
    • https://jipenudus.weebly.com/uploads/1/3/1/4/131406532/194544bb279.pdfIn PDF document text
    • https://pumelagu.weebly.com/uploads/1/3/2/8/132814433/1235252.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478134/normal_600cb4cc4a164.pdfIn PDF document text
    • https://wodanosivowifig.weebly.com/uploads/1/3/4/5/134593279/2685592.pdfIn PDF document text
    • https://gopoxigubujazu.weebly.com/uploads/1/3/0/9/130969754/dupofuzesej_kofabi.pdfIn PDF document text
    • https://rabuwamefikulo.weebly.com/uploads/1/3/1/3/131398373/ef31ad5.pdfIn PDF document text
    • https://cdn.sqhk.co/zidulibu/jjYjfjj/photo_editor_apple.pdfIn PDF document text
    • http://wavokumad.iblogger.org/love_feeling_hd_video_songs_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366306/normal_6005eadcdcbb1.pdfIn PDF document text
    • https://xexigajusotojuz.weebly.com/uploads/1/3/1/6/131606060/fepudenafovo.pdfIn PDF document text
    • https://cdn.sqhk.co/vemetafije/ggXijhc/94530799066.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_abf8beb190134b7c9c494e9e73bc5939.pdf?index=trueIn PDF document text
    • https://6b137298-3864-41c5-aaa3-11744000c3c2.filesusr.com/ugd/b916f4_9d5a5d6459da44eb94ec715586c0c316.pdf?index=trueIn PDF document text
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_462a09419be241a59eff12ae09209ed0.pdf?index=trueIn PDF document text
    • http://vusatalejud.epizy.com/jorezu.pdfIn PDF document text
    • http://gedokimisizat.rf.gd/ammonia_refrigeration_training_guide.pdfIn PDF document text
    • https://abee6ad4-cf47-459a-954e-22b9b9bb30ad.filesusr.com/ugd/4bdc6d_70202c68b9c44fe8acd67dfe92078adc.pdf?index=trueIn PDF document text
    • https://67bb8873-ca08-4da4-87c0-60a8072ebff6.filesusr.com/ugd/a838c0_d124d5af9413455eae3b8e603ca88ed8.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC79 8984 bytes
SHA-256: fe1b344bbf5f014a9b1cb50acd22553447d5639ef7aeb2a21ee582fa1af48a64
font_01_sfnt_off000109cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CB 5256 bytes
SHA-256: d32985123969ef9d32fbe413c258d569d8f5b511ec278ae784d0f5e47175f8a7
font_02_sfnt_off00011b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B93 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_03_sfnt_off00012420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12420 11276 bytes
SHA-256: 606977e526196266c227e1236c482335a0ee207acd00f63bf5095509ac3f52ab

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