Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eb9da0a8a724d2a…

MALICIOUS

PDF

78.7 KB Created: 2021-06-08 04:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 691bb27a36f2a24863b28d203d4adccc SHA-1: e358ac0f1c8313074ff86766e3ea171f769ee150 SHA-256: 6eb9da0a8a724d2a0707010ba2704ed39031279afc578798d5a99bb66c175c1c
194 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing lure, employing a link farm strategy to direct users to potentially malicious websites. The presence of numerous external links, many hosted on disposable domains, combined with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests a malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs indicate a workflow designed to exploit user trust for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/pbw?utm_term=convert+pdf+to+png+image+online
    • https://waluxine.weebly.com/uploads/1/3/4/7/134759732/zujilu_bubejimenuru_jikesizez_sopojiwipawudax.pdf
    • https://pabimoju.weebly.com/uploads/1/3/3/9/133997489/xagitobazu.pdf
    • https://tutetalugono.weebly.com/uploads/1/3/1/8/131857120/39bb295603dd2f.pdf
    • https://bovuvodesibos.weebly.com/uploads/1/3/4/3/134377535/winubepimog.pdf
    • https://fuxarudoniw.weebly.com/uploads/1/3/5/3/135350341/dasuwo_konajedo.pdf
    • https://cdn-cms.f-static.net/uploads/4392442/normal_60400c5c8e78a.pdf
    • https://vejikawotepux.weebly.com/uploads/1/3/4/8/134887167/pazetukajewuxagil.pdf
    • https://xuwutofir.weebly.com/uploads/1/3/0/8/130813860/tafeso_kemokezel_naxalitavebame.pdf
    • https://static.s123-cdn-static.com/uploads/4412377/normal_5feea4bcbba1d.pdf
    • https://rigozogukex.weebly.com/uploads/1/3/3/9/133986215/8877854.pdf
    • https://diwapaxifok.weebly.com/uploads/1/3/4/4/134488462/37cc6110d67fb.pdf
    • https://dekilaroturiti.weebly.com/uploads/1/3/1/8/131856809/tutuv.pdf
    • https://cdn-cms.f-static.net/uploads/4418579/normal_5fd3da492d4d6.pdf
    • https://fovofenat.weebly.com/uploads/1/3/4/4/134489119/bf0f4dff0e.pdf
    • https://zuzidoparifiga.weebly.com/uploads/1/3/5/3/135302874/6741629.pdf
    • https://static.s123-cdn-static.com/uploads/4378605/normal_5feb2b6e020c3.pdf
    • https://cdn-cms.f-static.net/uploads/4481520/normal_604d46bea8c9d.pdf
    • https://mebagotu.weebly.com/uploads/1/3/4/4/134444887/171637.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nuwiwaweber.pbworks.com/w/file/fetch/144613278/navneet_digest_std_10_maths_download_in_gujarati_medium.pdf
    • http://pebenuziwi.pbworks.com/f/zagoga.pdf
    • http://najajadux.pbworks.com/w/file/fetch/144586920/niragoxofosow.pdf
    • http://gifavipa.pbworks.com/w/file/fetch/144588783/12218859087.pdf
    • http://zezimin.pbworks.com/f/apple_watch_series_5_44mm_cellular_price_in_canada.pdf
    • http://busututesemo.pbworks.com/f/naruto_total_drama_crossover_fanfiction.pdf
    • http://xosufixemuf.pbworks.com/f/is_there_a_remote_app_for_non_smart_tv.pdf
    • http://wurutaw.pbworks.com/f/expert_grill_pocket_digital_instant_read_meat_thermometer_manual.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e238.bin
4dcc3c02a6a9dd4052d345c0918ab0dae48993be2bea5cd8dfd678e4beb5a842
pdf-font-stream PDF embedded font (sfnt) at offset 0xE238 5148 bytes
font_01_sfnt_off0000f3af.bin
4833a490c881635a35ef3503f944bbecb61fb7a1612a270a9df08402553a59c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AF 10596 bytes
font_02_sfnt_off000117fd.bin
52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550
pdf-font-stream PDF embedded font (sfnt) at offset 0x117FD 16036 bytes