Malicious PDF — malware analysis report

Static analysis result for SHA-256 f44337972b22a6c5…

MALICIOUS

PDF

76.5 KB Created: 2021-05-13 07:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 055b55429072df2d5ee0e7fb24183264 SHA-1: 9c901d5e9adb0c7349d8ca527f718dc5103ffc6c SHA-256: f44337972b22a6c5211ceb99c33259a80cb3f0ef88938dffb11f7248fd441ffc
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing campaign. The presence of 'utm_term' in one URL and the overall structure point towards an attempt to trick users into clicking malicious links, likely for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://fokemale.ru/strik?utm_term=excel+formula+if+cell+contains+text+then+multiply PDF link annotation
    • http://bloodcraft.online/mcgraw_hill_texas_algebra_1_answersuqijw.pdfIn PDF document text
    • http://dokakepitizix.medianewsonline.com/asamblea_nacional_constituyente_venezuela.pdfIn PDF document text
    • https://xuvamifete.weebly.com/uploads/1/3/0/8/130874567/222bda.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/hadfr7i/kid_popping_bubble_wrap_with_head_gif.pdfIn PDF document text
    • http://maxiteguf.medianewsonline.com/81993388734.pdfIn PDF document text
    • https://vukojudal.weebly.com/uploads/1/3/5/3/135317211/8567218.pdfIn PDF document text
    • https://dadanesikukuno.weebly.com/uploads/1/3/1/4/131438481/tobobiroz.pdfIn PDF document text
    • http://kipokefurur.mygamesonline.org/sp3d3_hybridization.pdfIn PDF document text
    • https://pukegivox.weebly.com/uploads/1/3/1/8/131856392/gedixipojowusaramoku.pdfIn PDF document text
    • http://antinomi.design/how_to_fold_total_gym_elitel5omz.pdfIn PDF document text
    • http://vamoktin.ru/barber_logo_psd_freee6e52.pdfIn PDF document text
    • http://kenugizi.getenjoyment.net/possessive_adjectives_exercises_beginner.pdfIn PDF document text
    • https://cdn.sqhk.co/wudawagirus/Szgdhe1/77831899244.pdfIn PDF document text
    • http://leledup.mypressonline.com/zufetaruvibezogajujitile.pdfIn PDF document text
    • http://fojefojegut.medianewsonline.com/54217129346.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mawidinivetobi.myartsonline.com/xipajanozopamufabipupov.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/meluwawefapibisoju.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/fokoxefewologasaxik.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/usda_dietary_guidelines_definition.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_off0000ec23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC23 5380 bytes
SHA-256: bfb124d8e35da773386dffefd8aab23f4b2f28e23fa6b00c1427c13dea3306b3
font_01_sfnt_off0000fe51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE51 11188 bytes
SHA-256: 4e8ad3c0182829bdebfde2ed3b033fa5f06a23a3071d8d48443f3827d7e7954d

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