Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d68c0797fbc323…

MALICIOUS

PDF

80.0 KB Created: 2021-03-15 08:22:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8e69f10b490ef80ccc4097584ae84f7b SHA-1: b19d4ed10b7a4ef513527756864684edc1369824 SHA-256: a2d68c0797fbc323fd29d8666b83fe130fbf95a5b5fdb4dfc4bdd30670d6e3b6
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/123?utm_term=alice+in+wonderland+piano+notes+pdf PDF link annotation
    • https://cdn.sqhk.co/guzufaseba/g21qjdi/88721515666.pdfIn PDF document text
    • https://cdn.sqhk.co/xaselavub/hfUdsib/yeezy_350_bred_on_feet.pdfIn PDF document text
    • https://cdn.sqhk.co/wixefawoz/jcvCyhf/96541598944.pdfIn PDF document text
    • https://cdn.sqhk.co/bawusipa/aihjaid/sibujimitaf.pdfIn PDF document text
    • https://cdn.sqhk.co/buzaxelubot/7XgiydU/checkers_2_for_4.pdfIn PDF document text
    • https://kumajevebak.weebly.com/uploads/1/3/1/8/131856027/pasozip-tomoxokuleji-funivowititeka.pdfIn PDF document text
    • https://cdn.sqhk.co/bikakigiben/giictzl/wolf_girl_drawing_easy.pdfIn PDF document text
    • https://gofizunesiwez.weebly.com/uploads/1/3/0/8/130874053/dopavaxewumu_jeniginagez_xobewovijur.pdfIn PDF document text
    • https://cdn.sqhk.co/vonirosidejo/3ZEheC4/10479672163.pdfIn PDF document text
    • https://terimigekebala.weebly.com/uploads/1/3/0/7/130738799/1020265.pdfIn PDF document text
    • https://nibadaxolakawub.weebly.com/uploads/1/3/4/8/134882114/3368942.pdfIn PDF document text
    • https://cdn.sqhk.co/mozoposowi/fxyibfl/emulator_nintendo_64_roms.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/iglvwdr/virevedowamonatar.pdfIn PDF document text
    • https://cdn.sqhk.co/vekosozob/hjjigih/9023984912.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://12c21f6a-324e-488c-af83-7e1076049286.filesusr.com/ugd/e84f25_2a2300b34607438d882ff0ff47d16450.pdf?index=trueIn PDF document text
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_87e4a4dde5c04ea3a3761b9240ee2995.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5633ff2-8b9e-421b-8da5-cee9bc0503cd/digitech_rp200_expression_pedal_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59e7a07f-6d38-4799-b546-b2356422b724/ace_personal_trainer_exam_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9035a12-d9fb-41bb-ab94-2230f9f7a138/badonadubigigirogokotufav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b18dacce-c925-40f1-bf03-545f027cbf2d/28638621181.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11f547e5-6e05-4a0b-9bb6-739b8c3fe952/disney_plus_on_old_apple_tv_3rd_generation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99928d5f-79dd-4277-8cd8-a93e9aca7b76/whirlpool_top_load_washer_door_locked_light_flashing.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC09 5016 bytes
SHA-256: 0a3503c02998c3eda7192902dca35d6d512c744f1e1e9838d2fb37f1c78f11c4
font_01_sfnt_off0000fd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD23 11732 bytes
SHA-256: 939018418f52f4826baaa81787c77de128b1857a3849054e7c2fd7bce12c2f99
font_02_sfnt_off0001252b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252B 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3