Malicious PDF — malware analysis report

Static analysis result for SHA-256 12fc608331512aac…

MALICIOUS

PDF

82.7 KB Created: 2021-04-19 07:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 79c08c3fc110033759bc6c376da39116 SHA-1: 9bbea5b7f9b698c020962c388467bfd822598e01 SHA-256: 12fc608331512aac18e11c7ef59da3a4d0c7dac47a36a6e2c9f61de0f0241c14
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://pelibifir.ru/strik?utm_term=is+psychological+statistics+hard PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4502920/normal_6019c8ed91140.pdfIn PDF document text
    • https://sowematawenuw.weebly.com/uploads/1/3/1/1/131164153/6131297.pdfIn PDF document text
    • http://chambre.xyz/what_to_get_your_goddaughter_for_baptism3ohkx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393639/normal_5fd1200a75fd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413469/normal_6026dc547b8eb.pdfIn PDF document text
    • http://resimpub.com/gobivepedanumomutiga5l6hb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462037/normal_6022e838d0774.pdfIn PDF document text
    • http://nakrutkavk.site/10_easy_guitar_songs_without_chords9jy05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391335/normal_6063464e7f7dc.pdfIn PDF document text
    • http://watercart.ru/wefadagegorapufuwogod7m897.pdfIn PDF document text
    • https://fitisajinuno.weebly.com/uploads/1/3/0/7/130739553/5391559.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387701/normal_60533c359a618.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://s3.amazonaws.com/loxopudizus/53682069971.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/gulonogafux.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/wildgame_innovations_camera_delay_setting.pdfIn PDF document text
    • https://27a83426-c768-4525-a63d-b5b732cca755.filesusr.com/ugd/28b3f7_85cfab8d2d564b6abe272ee00e772928.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sabegokek/bengali_cartoon_video_3gp.pdfIn PDF document text
    • https://0c17d2ad-06a2-4efd-9128-26148cac6670.filesusr.com/ugd/44320b_6aeb483e727146aa91f24f21ad29cec6.pdf?index=trueIn PDF document text
    • https://336ddc11-c37d-4cd6-9685-7accad2975f7.filesusr.com/ugd/479fa9_cae2d7b555184bdc808496a6c597bf95.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF982 4940 bytes
SHA-256: 7ba270ea24bd49d8072ff2c2cec26c2ac6194a132d7e77120bc7749327c2807a
font_01_sfnt_off00010a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A57 10804 bytes
SHA-256: b6f8e8e24c4c6def3a2bf322901edc6754f66c4e6737b5a60a1da0e153da3ad7
font_02_sfnt_off00012f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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