Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd312abf6d42157c…

MALICIOUS

PDF

78.4 KB Created: 2021-02-26 09:54:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 422e576931d44794caa016a983db1d7c SHA-1: 8434b167325ac18d21259374ae230d3e219457ee SHA-256: fd312abf6d42157cc728ec23ee6b55ab901c5ca926c94674f714d6c8167d8010
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or redirection scheme. The document body, though partially corrupted, includes text related to writing rental agreements, likely serving as a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://maypoin.ru/strik?utm_term=how+to+write+up+a+rental+agreement PDF link annotation
    • http://tipaxoj.66ghz.com/free_fillable_calendar_template_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/jotenitix/hc5jg0z/anime_manga_wallpapers_hd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493578/normal_6008d25f49666.pdfIn PDF document text
    • http://zomusip.iblogger.org/shakedown_the_score_song.pdfIn PDF document text
    • http://vosalax.22web.org/vanadiginebonofatuxen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380705/normal_5fe89ce1845fb.pdfIn PDF document text
    • http://vasamekekegu.iblogger.org/fractions_of_quantities_ks2_worksheets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403959/normal_6015307d96b59.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tavopaku.rf.gd/97724664721.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/24553063090.pdfIn PDF document text
    • http://volenivojox.epizy.com/chuyn_i_file_sang_file_jpg.pdfIn PDF document text
    • http://vapovalexuma.epizy.com/83683067448.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/baby_blue_formal_dresses_for_sale.pdfIn PDF document text
    • http://borowif.epizy.com/storm_front_book_review.pdfIn PDF document text
    • http://gufobipadu.epizy.com/fire_red_pokemon_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/vehicle_insurance_claim_form.pdfIn PDF document text
    • http://gedamodeges.epizy.com/91699646288.pdfIn PDF document text
    • http://mufozugiro.rf.gd/segewovaxe.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_off0000f4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B7 5012 bytes
SHA-256: f61074466b3b7a73c4703d523318fac088629686da6d00b7998241b1dcd51b72
font_01_sfnt_off000105bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BF 10884 bytes
SHA-256: a2779c4986fad1da5d3e0fe25361ceb1e18544c295bd721d379f27bcfcca7d53

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