Malicious PDF — malware analysis report

Static analysis result for SHA-256 aec5aa34b16fa8c3…

MALICIOUS

PDF

85.7 KB Created: 2021-03-07 09:05:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 9abf52e3fa2c47eff09553e57d002276 SHA-1: 5659da44131f3761e68f064b37bfa9caa6335d0b SHA-256: aec5aa34b16fa8c324217b6fc0b304a9bcc6106678b9152aa0639a0297bd4264
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it's part of a link farm or phishing campaign designed to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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/award?keyword=counting+by+7s+movie+cast PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369182/normal_5fd8df6d4e12a.pdfIn PDF document text
    • http://losqutoq.online/xodutijenimusugunp267h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454977/normal_603c6e1f16d53.pdfIn PDF document text
    • http://keep-travel.com/povowovovupegixuz6kxd.pdfIn PDF document text
    • http://ekzo-fruit.ru/78550434093af7zg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420588/normal_602db0f8b53cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448991/normal_603606edacdd4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454677/normal_5fef0a4c312ea.pdfIn PDF document text
    • http://wurilozi.scienceontheweb.net/fotuzadoxaxemizux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408001/normal_60177488703bc.pdfIn PDF document text
    • http://keepxufi.space/piguzatasokevifux6mc16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420917/normal_601f7c5033748.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412899/normal_5fd5f08890c36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387712/normal_5ffc37489aff0.pdfIn PDF document text
    • http://fapasevusiledap.mygamesonline.org/how_to_reset_a_genie_intellicode_garage_door_opener.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/aac42ca1-ef4b-41d4-acc9-e1a47b25e19e/xoxozafulilovomumodam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e439fe0-d0da-4d8e-b477-84e4800805b4/xawusefujodapawenotab.pdfIn PDF document text
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_b3df108725944e0d82706a520dac1d92.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2423af5e-f46b-4d02-8bc2-019f0b5e3db5/will_stock_market_crash_in_2021.pdfIn PDF document text
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_8ce51d633abf4bcaa2d4b05015d0cbec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/df3e994e-6c13-434a-89c7-8f00dc8103b2/burger_king_near_me_hiring_at_14.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_off00011369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11369 5280 bytes
SHA-256: e96ba7b4de5ab8da8cd3f7aeca881010bbf6e606367146340824907e86ecb0c0
font_01_sfnt_off00012560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12560 10656 bytes
SHA-256: 1f3081041cd6c2314f16bfebdfb6a6e3ba3b7bc996bd1583a020730bf4194ad6