Malicious PDF — malware analysis report

Static analysis result for SHA-256 51a35a1599fa44ac…

MALICIOUS

PDF

89.8 KB Created: 2021-03-05 07:13:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 95075c836baf18b75a2560c377147b20 SHA-1: 7d48d3ad437e4134051fef413d6f6113196217d8 SHA-256: 51a35a1599fa44acb8ef217a0f3a028407c237d86f2f246d1755b377a6dcf37e
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 embedded URLs, many of which point to disposable hosting and are likely used for phishing or distributing further payloads. The document body, though partially obfuscated, suggests a lure related to 'crochet pattern for blanket with chunky yarn', which is a common tactic to disguise malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/strik?utm_term=crochet+pattern+for+blanket+with+chunky+yarn PDF link annotation
    • http://ellmax-site.xyz/breadman_plus_owners_manual2pudc.pdfIn PDF document text
    • http://politach.com/407881773256c4ih.pdfIn PDF document text
    • http://stebsmeh.space/61529885599ium76.pdfIn PDF document text
    • http://badgesverified.com/mizisigividilonx15o.pdfIn PDF document text
    • http://callup.today/ted_baker_glasses_b894khmt0.pdfIn PDF document text
    • http://disozire.mygamesonline.org/15924379167.pdfIn PDF document text
    • http://septiki-rf.website/lowrance_elite_7_hdi_review62psu.pdfIn PDF document text
    • http://getoditatogufop.22web.org/88670527768.pdfIn PDF document text
    • http://ilkertr.shop/scrum_burndown_chart_excelw9tfv.pdfIn PDF document text
    • http://logmeinnow.xyz/decision_wheel_templateetmpt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0ecef3a8-5193-4df1-8dcb-1b7dd0f2be2a.filesusr.com/ugd/e6092c_92839cf48006413ca4a916f06b062438.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/midixara.pdfIn PDF document text
    • https://e1bd05e7-a2ed-43df-b5fc-9bc8ee0b1a84.filesusr.com/ugd/08acf3_13df946af6e34603a82c45196ef2972b.pdf?index=trueIn PDF document text
    • http://titugol.atwebpages.com/wozotez.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/char-_broil_performance_grill.pdfIn PDF document text
    • http://fokodema.epizy.com/65296795121.pdfIn PDF document text
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_92812d1b6657464baca8a7d9c33d2a91.pdf?index=trueIn PDF document text
    • http://fepevakadiw.rf.gd/wexof.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/technical_project_report_sample.pdfIn PDF document text
    • http://leveroratex.rf.gd/fivewivis.pdfIn PDF document text
    • http://xujalupa.epizy.com/kirchhoff_s_laws_questions_and_answers.pdfIn PDF document text
    • https://0cc2a7d0-6f33-4335-9ec9-554d9418487e.filesusr.com/ugd/cb4a18_c53ce01ab3174fe59d2695ce46cf725b.pdf?index=trueIn 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_off000122d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D2 5228 bytes
SHA-256: 0c0f0c3bb989c971ace5ea14ed5b6d7804806e3b0bd344f15c8c2a8c6ae139cc
font_01_sfnt_off000134ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AB 10800 bytes
SHA-256: 75a3f4c3dce721f8fd6933395448cd2708d0bdccc75a8ee51c4ec9041ebe91fe

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