Malicious PDF — malware analysis report

Static analysis result for SHA-256 7590a865ee265837…

MALICIOUS

PDF

86.8 KB Created: 2021-04-13 16:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: ebacc537fbcc75ea7f5eccbb1dc30c8b SHA-1: 5c1ffcd81338195fbac2d2a675fa1cf5a6ee6e6b SHA-256: 7590a865ee265837d0a21076917581d20930a2c161ea7ac6de1153c1020aeba3
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected it as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nipisod.ru/strik?utm_term=vizio+sb2821-d6+specs PDF link annotation
    • https://cdn.sqhk.co/libuzewis/g6tihwD/53709592934.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/fk6hdIu/amazon_kindle_fire_hdx_8._9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449411/normal_605fe92cc4d22.pdfIn PDF document text
    • https://cdn.sqhk.co/kerametunal/dhg46Ie/nemugixevab.pdfIn PDF document text
    • https://vezerovir.weebly.com/uploads/1/3/4/5/134580053/7625473.pdfIn PDF document text
    • https://cdn.sqhk.co/zuzipogowita/lcf1jcn/rope_swing_seat_buy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383561/normal_60581af79751d.pdfIn PDF document text
    • https://zememaxuzibur.weebly.com/uploads/1/3/5/3/135326459/kujamakosimesej.pdfIn PDF document text
    • https://laziboxejebemu.weebly.com/uploads/1/3/0/7/130740401/bureluwika.pdfIn PDF document text
    • https://cdn.sqhk.co/gozawelesutu/ghAahjk/cressman_tool_boxes_at_lowes.pdfIn PDF document text
    • https://cdn.sqhk.co/fexilejedit/bgf84hg/nelibeni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469359/normal_603926e06c1d6.pdfIn PDF document text
    • https://cdn.sqhk.co/xefijumu/jiifjdW/xexawavasubalojifamopaku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451762/normal_602945265c349.pdfIn PDF document text
    • https://melekutiruj.weebly.com/uploads/1/3/2/7/132740408/xodivan.pdfIn PDF document text
    • https://fanesorugetefex.weebly.com/uploads/1/3/1/3/131383934/rugetijujapojaxefoza.pdfIn PDF document text
    • https://nulesurusisozi.weebly.com/uploads/1/3/4/7/134744420/259c13ed03f.pdfIn PDF document text
    • https://faneboluti.weebly.com/uploads/1/3/4/4/134464249/jujawobu.pdfIn PDF document text
    • https://cdn.sqhk.co/pevotido/egjhGhc/ledefafisefuripef.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/jejulurowev/bt_video_baby_monitor_3000_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/modern_reloading_2nd_edition_richard_lee.pdfIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/apache_file_speed.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_off0000f2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CA 5048 bytes
SHA-256: d3e3c57b1582b84320f326704f5615315bb15a95e1775118e32795b3bfccc78a
font_01_sfnt_off00010402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10402 11148 bytes
SHA-256: 0a135138afc55fd60fa5944eb0862b353ef2bc616188b0de02187efc0485e043
font_02_sfnt_off00012a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2C 16220 bytes
SHA-256: e52cbbafa57115ee9de0898d55815218ed3313674b7e5a885b05cdf9726c14b7
font_03_sfnt_off00013f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F6D 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3