Malicious PDF — malware analysis report

Static analysis result for SHA-256 903b69cac5ff8e5d…

MALICIOUS

PDF

83.0 KB Created: 2021-02-16 11:12:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1c48ef50bb57c506399e8af396012c21 SHA-1: 2b4dd1c5b58793b6040ae9ca640b5767817a629b SHA-256: 903b69cac5ff8e5dbb64a2dd2287dd3dbd5943470f9f5c3bd9c5669ada56719e
186 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 pointing to disposable hosting services, indicating a link farm or SEO spam operation. The embedded URLs and the ML classifier strongly suggest malicious intent, likely to redirect users to phishing or malware sites. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=2005+buick+lacrosse+headlight+assembly+removal PDF link annotation
    • https://cdn.sqhk.co/dutedape/8ijsjcU/52631317652.pdfIn PDF document text
    • https://cdn.sqhk.co/tabuguran/MHBbhib/songpop_2_guess_the_song_itunes.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/giI1ujh/30695440909.pdfIn PDF document text
    • https://cdn.sqhk.co/tozegatopaxu/gf8KpCe/ww2_quiz_questions_hard.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/jjhdcid/happy_glass_app_cost.pdfIn PDF document text
    • https://vimiwegom.weebly.com/uploads/1/3/0/7/130775837/kikolivarawigu-rimokusana-fajob.pdfIn PDF document text
    • http://am-sound.ru/royal_caribbean_cruise_datescn8q6.pdfIn PDF document text
    • http://ig-socialmedia.xyz/dfinition_amnagement_du_territoire58eqt.pdfIn PDF document text
    • https://cdn.sqhk.co/vateviti/diaXji9/najimubebowoluzixodozu.pdfIn PDF document text
    • http://kindraretterath.com/batman_begins_gba_gameb78au.pdfIn PDF document text
    • http://alphabitx.com/38195843593rc3a7.pdfIn PDF document text
    • https://kenigoxiwe.weebly.com/uploads/1/3/0/9/130970014/falenarinalo.pdfIn PDF document text
    • https://nukarefu.weebly.com/uploads/1/3/4/1/134131348/daminuxemexe.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/j6hiY2X/woodshop_wood_storage_ideas.pdfIn PDF document text
    • http://mopomelodow.iblogger.org/ms_word_family_tree_template_free.pdfIn PDF document text
    • https://gevivefopunuxaf.weebly.com/uploads/1/3/4/3/134331765/de2a94accf88.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A4 6020 bytes
SHA-256: 2981133b47939428227f549bce5610f6f91ae952a03fbf486f30ee7e8d0842de
font_01_sfnt_off00011903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11903 11092 bytes
SHA-256: 346542a0c1cab9078ce73ef59ca226f979ee28bc58158aef24ea0b526cb330b1

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