Malicious PDF — malware analysis report

Static analysis result for SHA-256 b949f856b9da9097…

MALICIOUS

PDF

106.9 KB Created: 2021-02-03 21:28:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: d21d13fe8f71afc0ff6855f6f0a39500 SHA-1: ecbd95866a86676daa728909302a1c11ec03aab6 SHA-256: b949f856b9da9097b6cdce6cd28a58112f21abc3495832908a38fadbf8fc2fa5
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are SEO-optimized and point to benign-looking documents, but one primary URL leads to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to search terms, suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/123?utm_term=jennifer+serravallo+reading+strategies+pdf PDF link annotation
    • https://limowofexi.weebly.com/uploads/1/3/4/2/134235517/kudaw.pdfIn PDF document text
    • https://fumitosebajogo.weebly.com/uploads/1/3/0/7/130740118/e5192fce.pdfIn PDF document text
    • https://mifopubulu.weebly.com/uploads/1/3/1/6/131637027/09dda50dfef7.pdfIn PDF document text
    • https://neninilez.weebly.com/uploads/1/3/3/9/133986457/palexori.pdfIn PDF document text
    • https://dezazobe.weebly.com/uploads/1/3/4/7/134755526/zaxefebuke.pdfIn PDF document text
    • https://nixawajumumija.weebly.com/uploads/1/3/4/3/134338940/cbe8e6e6476d.pdfIn PDF document text
    • https://nelurorinubix.weebly.com/uploads/1/3/1/3/131384252/766e9b76.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/doxifuba/affliction_warlock_leveling_guide_wotlk.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/33806291727.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/comic_book_template_with_speech_bubbles.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/free_antivirus_for_pc_and_mobile.pdfIn PDF document text
    • http://wibenuke.epizy.com/granny_mod_menu_outwitt_latest_version.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/95123825325.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/chhaila_bihari_song.pdfIn PDF document text
    • http://mivowejow.rf.gd/algebraic_topology_book.pdfIn PDF document text
    • http://sixijoras.epizy.com/naneputaguwukevotijez.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_off000157cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157CF 5044 bytes
SHA-256: c6d0a80f875c4358e41a7dfbae9ce2fe408eaaf2f68a5f4ea9a637be7133dddf
font_01_sfnt_off00016909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16909 11328 bytes
SHA-256: 529e4bcd3e3cf97817bcaeb88233d5f7f45d8da17e57c83ff27ba0d67c9296a8
font_02_sfnt_off00018f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F9E 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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