Malicious PDF — malware analysis report

Static analysis result for SHA-256 3061a0ea92da11cf…

MALICIOUS

PDF

77.7 KB Created: 2021-01-13 02:05:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: cf484de16e957c6e72bb54db1b1540f3 SHA-1: 9b828660f2284855acda174a49308001aa2ce678 SHA-256: 3061a0ea92da11cf2fb1da2fdfb83ec6b641a0ef15f3771c03c02512a92bde2e
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a mass of external links, likely to manipulate search engine results or host further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing or content-farming attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffset.ru/aws?utm_term=reporting+estimated+marginal+means+apa PDF link annotation
    • https://tefufujilidawa.weebly.com/uploads/1/3/4/5/134578337/6bbb9fe7cd79eb4.pdfIn PDF document text
    • https://wamazuwo.weebly.com/uploads/1/3/1/3/131380988/1347248.pdfIn PDF document text
    • https://kajurizekevebok.weebly.com/uploads/1/3/4/5/134586758/2117010.pdfIn PDF document text
    • https://vifabuwu.weebly.com/uploads/1/3/1/6/131606679/regufuwiwezodulaba.pdfIn PDF document text
    • https://cdn.sqhk.co/mevexobuzur/iXqM7gc/gupoxopikovogisa.pdfIn PDF document text
    • https://dawoxojukuput.weebly.com/uploads/1/3/4/8/134890950/vewajobizukonevaja.pdfIn PDF document text
    • https://site-1178836.mozfiles.com/files/1178836/balu_movie_songs_please.pdfIn PDF document text
    • https://site-1205690.mozfiles.com/files/1205690/white_monkey_running_meme.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvexudid/hhoH4D0/auto_reply_outlook_web_app.pdfIn PDF document text
    • https://niwanuve.weebly.com/uploads/1/3/1/4/131406473/3386866.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kabisebax/91569962209.pdfIn PDF document text
    • https://s3.amazonaws.com/fufaragebo/mukapolafoju.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/zara_man_shirt_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/expert_sphere_grid_map.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/football_shirt_template_back.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/pandora_free_music_app_for_android.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_off0000f2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B6 5288 bytes
SHA-256: 160294f2b5afc317ba199a6e3f54428b97c8132ce026dceac1f0dcd3660697e9
font_01_sfnt_off0001049f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049F 10916 bytes
SHA-256: 12680f312ce4e3cc818741bf8f00b16b7d068d60add75779de652df22168d8e5

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