Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4f2caf6867c628…

MALICIOUS

PDF

69.9 KB Created: 2021-02-17 01:11:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 2dd2c2f54acbc3f5e025023b43a45d10 SHA-1: cc49fb9e2f8a590649a72b9fae12acd23d13a5a9 SHA-256: ac4f2caf6867c6286f626d1f14c6a271813255110f6595ddbedeff983eff5c7b
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links pointing to disposable hosting services, suggesting an attempt to distribute content or redirect users to malicious sites. The presence of SEO-optimized PDF links further indicates a sophisticated lure mechanism, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://jottigo.ru/strik?utm_term=how+to+stop+call+forwarding+on+iphone+8 PDF link annotation
    • https://cdn.sqhk.co/wufevinek/iahfWyT/mario_kart_8_stars_after_race.pdfIn PDF document text
    • https://cdn.sqhk.co/molavagew/jfhh0LK/politics_home_newsletter.pdfIn PDF document text
    • https://cdn.sqhk.co/vibebexez/jhLLghB/polytone_mega-_brute_amplifier.pdfIn PDF document text
    • https://cdn.sqhk.co/makulowujip/2ifAeib/zombies_monsters_robots_shut_down.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolefowi/dibKhf5/sotiwarudasiluw.pdfIn PDF document text
    • https://cdn.sqhk.co/posebozej/fIzuoKQ/download_alarm_anti_theft_lock_screen.pdfIn PDF document text
    • https://gesimuto.weebly.com/uploads/1/3/4/6/134685476/kegowelidoguw.pdfIn PDF document text
    • https://wederubumojap.weebly.com/uploads/1/3/5/3/135393822/vozaxo-xizenudutuj-zukobisijuja.pdfIn PDF document text
    • http://batizilojado.22web.org/lake_monroe_florida_crappie_fishing_report.pdfIn PDF document text
    • https://cdn.sqhk.co/tigufarejeti/BxjgnGW/form_5_account_bab_1.pdfIn PDF document text
    • https://lobusuzagoti.weebly.com/uploads/1/3/4/4/134470260/loxunubivur.pdfIn PDF document text
    • https://sovopubi.weebly.com/uploads/1/3/0/7/130775052/ac8b0ddcef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_5fd132b84376a.pdfIn PDF document text
    • https://valodoxajub.weebly.com/uploads/1/3/4/4/134435871/82c3099.pdfIn PDF document text
    • http://jerazuxu.iblogger.org/towepi.pdfIn PDF document text
    • https://cdn.sqhk.co/wezokobuli/rhdcggF/98140719564.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
    • http://tituroxir.rf.gd/galvanized_roofing_sheet_nigeria.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_off0000c5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E6 5452 bytes
SHA-256: 27eafc9879f051e1a2f9c42ec699b52d03030630d715d9c223c5ae40f2bc2180
font_01_sfnt_off0000d86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86F 10488 bytes
SHA-256: c9a8b6f185fa7c2d4c21f675e71545da276c060ca463b798bbce5b0578b333a6
font_02_sfnt_off0000fc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5B 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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