Malicious PDF — malware analysis report

Static analysis result for SHA-256 3488e5e3439ab7b3…

MALICIOUS

PDF

81.8 KB Created: 2021-05-10 19:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 1cb51d9f9359bc909bd58f505fb87f7a SHA-1: 57e3e9a6cce154c0d9a3177f7aeae5fdb361f52b SHA-256: 3488e5e3439ab7b33a7d74e87f8a59ca322b77f35c7ab80dfff1fac1b6e98626
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 ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the document's structure are consistent with a tactic to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=how+to+tell+if+lines+are+parallel PDF link annotation
    • https://cdn.sqhk.co/lexelinowe/p1eDifh/moving_lock_screen_live_wallpaper_iphone.pdfIn PDF document text
    • http://fherixq.com/64586703074wre8k.pdfIn PDF document text
    • http://nickned.me/how_to_control_soundbar_with_xfinity_remotedfi0l.pdfIn PDF document text
    • https://lenexemumuvag.weebly.com/uploads/1/3/1/4/131438583/7c80b1.pdfIn PDF document text
    • https://vuzipelafow.weebly.com/uploads/1/3/4/6/134688966/8f635ba8a1e9712.pdfIn PDF document text
    • https://mabamigetope.weebly.com/uploads/1/3/4/4/134493328/3506987.pdfIn PDF document text
    • https://cdn.sqhk.co/rivojotewez/gcqjej0/download_musync_mod_apk.pdfIn PDF document text
    • https://wivapofeselaf.weebly.com/uploads/1/3/5/3/135317026/nuzol_ruvenelexati.pdfIn PDF document text
    • https://lomivatixipe.weebly.com/uploads/1/3/4/6/134673305/vekiti.pdfIn PDF document text
    • https://pixasarajesuwov.weebly.com/uploads/1/3/4/6/134688766/xakag.pdfIn PDF document text
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/8523286.pdfIn PDF document text
    • http://rodina38.ru/robin_hood_movie_2010_imdbv4dns.pdfIn PDF document text
    • http://sovetnik53.ru/pabetoluvarugumooxcgi.pdfIn PDF document text
    • http://sparzha.club/93579958722ru6zu.pdfIn PDF document text
    • http://rolovibabes.22web.org/balanza_analitica.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sazerubewufuzuk.epizy.com/zapamaxofumaluzevik.pdfIn PDF document text
    • http://wumipuxupixak.epizy.com/7064268917.pdfIn PDF document text
    • https://s3.amazonaws.com/timituvupame/wooden_dead_blow_mallet_plans.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/gazitakanusunuwog.pdfIn PDF document text
    • https://s3.amazonaws.com/moduluzuxikari/g_shock_ga100cm-5a.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/42948198027.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10235 4948 bytes
SHA-256: 55a98be723e30a7cca6841d272fc2c52ef8d75d71d4a5fe6a32dfcdf80f1facf
font_01_sfnt_off0001132b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132B 11456 bytes
SHA-256: e5f8df4c67a5e43babefe6f2205afd49a488b9cbf5493f4b90b830580126b888