Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c70d7becd86297…

MALICIOUS

PDF

90.0 KB Created: 2021-04-21 13:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c9d5b6f03fed1ddb11d0d90083529377 SHA-1: 13e54366fd178feb0a236614d1d0c834119a20d5 SHA-256: d3c70d7becd862973169f65d678456c4dfbaa326202b5bb921e8e262219b1695
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 0.9964

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/strik?utm_term=individual+development+plan+for+social+workers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426425/normal_605b432df2fee.pdfIn PDF document text
    • https://detitominaxa.weebly.com/uploads/1/3/5/3/135304018/7a32d6.pdfIn PDF document text
    • https://cdn.sqhk.co/vafegijateno/i5hjgip/17075346526.pdfIn PDF document text
    • https://cdn.sqhk.co/zozijawutuxu/6MhbmsU/jackbox_party_pack_7_game_list.pdfIn PDF document text
    • https://gefidiwe.weebly.com/uploads/1/3/0/7/130738847/wural.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474997/normal_60392e9e4e246.pdfIn PDF document text
    • https://misamizejip.weebly.com/uploads/1/3/4/3/134348089/vilole_bovutixuse.pdfIn PDF document text
    • https://xonimitofowe.weebly.com/uploads/1/3/2/6/132682232/e572da150efa95.pdfIn PDF document text
    • https://jakemujilofadam.weebly.com/uploads/1/3/1/3/131380171/bubix.pdfIn PDF document text
    • https://basedupapopulow.weebly.com/uploads/1/3/4/3/134344364/sujezefube_gepameluwaras_subigululad_xekirubogozi.pdfIn PDF document text
    • https://vagewojevibo.weebly.com/uploads/1/3/4/8/134873572/8215c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365576/normal_5ff552e6adcb0.pdfIn PDF document text
    • https://guvefivilemu.weebly.com/uploads/1/3/4/3/134397682/nazakigid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375908/normal_5fc85b4924512.pdfIn PDF document text
    • https://cdn.sqhk.co/pulazapusaw/iggge4S/22846996423.pdfIn PDF document text
    • https://cdn.sqhk.co/kubabulukod/ji0Eie1/18438300772.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447089/normal_5fe68e8432f4a.pdfIn PDF document text
    • https://kadamoxezegawuf.weebly.com/uploads/1/3/4/3/134347408/ca6930c.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/8fMnH9s/greek_god_of_light_crossword_clue.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/d8795f37-f90a-45c7-bd50-ce211a19815a/482544253.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dd0f336-fb28-48f3-a917-9fac64b47cf0/39932711415.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/756c4d61-1a59-4149-b51a-8db17e5b16a8/how_to_hook_up_logitech_z623_speakers_to_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/zabizosikaturinene.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/cfa_level_1_curriculum_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/the_fallout_book.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/78229106834.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/43906526688.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_off0001234e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234E 5456 bytes
SHA-256: ef55943367fa310d106feac2097480768b60ea9db73395c8a4cdbcc47d20e078
font_01_sfnt_off000135df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DF 10644 bytes
SHA-256: b8fe9e1d30533eda4dd45742286a983e4eab710cd84bc692c1b7207e6456e626