Malicious PDF — malware analysis report

Static analysis result for SHA-256 169f9c4d639a57bf…

MALICIOUS

PDF

89.3 KB Created: 2021-02-28 03:45:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4fd0f727b655a3b96a29ebb3f9f1ca8e SHA-1: 90d7f124262a14c3cf27bc14fec9878b91e05b5d SHA-256: 169f9c4d639a57bf5f4469ad965e0c1d439e7cefaf8c857a124d0ab455c3d351
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 0.9996

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://lozipotod.ru/wix?keyword=tower+defense+apk+offline PDF link annotation
    • https://wabatopopelak.weebly.com/uploads/1/3/0/7/130775953/wiziru_tulan_mejusiz_lufaxokane.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/hbifh2c/rineborer.pdfIn PDF document text
    • https://cdn.sqhk.co/bovokolel/WNrUHly/jivinuxawe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368989/normal_5fca4c686fa3f.pdfIn PDF document text
    • https://vemetufubejukat.weebly.com/uploads/1/3/4/3/134367776/4e14bb443.pdfIn PDF document text
    • https://cdn.sqhk.co/vabalogu/7jdTAic/formula_1_2018_game_career_mode.pdfIn PDF document text
    • https://nikubasixuza.weebly.com/uploads/1/3/0/7/130738960/ruzameji_batif.pdfIn PDF document text
    • https://mewejubakokexal.weebly.com/uploads/1/3/2/6/132681976/vononutevelajus.pdfIn PDF document text
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/2723952.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469641/normal_6016a59b6967e.pdfIn PDF document text
    • https://taxudomajifi.weebly.com/uploads/1/3/4/1/134108655/7267896.pdfIn PDF document text
    • https://gufekesunix.weebly.com/uploads/1/3/4/8/134888283/bibajebuso.pdfIn PDF document text
    • https://cdn.sqhk.co/febowozefu/alZhiAk/digabox.pdfIn PDF document text
    • https://cdn.sqhk.co/gedodupem/jcceAia/halloween_makeup_men.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/SJhh1jf/jewuvulefekoni.pdfIn PDF document text
    • https://gakafapokizi.weebly.com/uploads/1/3/5/3/135319358/3874926.pdfIn PDF document text
    • https://cdn.sqhk.co/zovifesojeme/hbOJDid/36329179818.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kisalonokexiwi.atwebpages.com/educational_psychology_woolfolk.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE39 5140 bytes
SHA-256: 1e77635a4e3270a22423df827c1b25940997fe851fb3bc78130b8dc2c4269059
font_01_sfnt_off00010fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD5 3348 bytes
SHA-256: daa5eb7e1f1986588f683144b0b2fb087925c79fbf43d147b5d2f8884e5f5ef9
font_02_sfnt_off00011d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D78 10412 bytes
SHA-256: a5affd93a0b73b024216daaa23107045c672e97445d78ffd56c54994d29d4c7a
font_03_sfnt_off0001415e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1415E 16300 bytes
SHA-256: 601c64305fe281b47a5d700a834c0b4d78c55c0e150dd4ec33566a2b00310526