Malicious PDF — malware analysis report

Static analysis result for SHA-256 361c12f345c498ed…

MALICIOUS

PDF

77.8 KB Created: 2021-02-23 06:14:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: cfe94f5177fc4369a4c31d6e6126f0f5 SHA-1: b65b17b29d4494785fc661d879d23ce25f58efc8 SHA-256: 361c12f345c498ed18af783d58109b70bf8df5c1ffeed92efcb0b6427fe8a0c7
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/123?utm_term=acer+aspire+one+722+price PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4488323/normal_5fdd8a148b42b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406223/normal_5fedf1dc9c2ac.pdfIn PDF document text
    • https://gamajebijapam.weebly.com/uploads/1/3/1/8/131856653/76b71ddc3b.pdfIn PDF document text
    • http://rikeropovi.22web.org/simply_wall_street_review_reddit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376874/normal_60073fc51e9c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449181/normal_6020911059e3e.pdfIn PDF document text
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/2229434d1e81.pdfIn PDF document text
    • https://lopuxewununoj.weebly.com/uploads/1/3/4/7/134748711/4288538.pdfIn PDF document text
    • https://xaxidotuviw.weebly.com/uploads/1/3/0/9/130968933/renuwove_gamatebovux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447467/normal_5ff67f3d25bb9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387807/normal_5ff9046eb6c76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483851/normal_5fdba8bfd13f7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rinivuwuvo.epizy.com/how_to_connect_magic_mouse_2_to_ipad_pro.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/65853985284.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/wawogokamez.pdfIn PDF document text
    • http://vejesigivilowen.rf.gd/report_power_out_duke_energy.pdfIn PDF document text
    • http://woxutonugosafer.epizy.com/tewipusogaxiwuxopala.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/mobowusim.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/1116092000.pdfIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/26103518704.pdfIn PDF document text
    • http://vumavoralamo.rf.gd/bellini_60cm_curved_glass_rangehood_manual.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_off0000f29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29A 5096 bytes
SHA-256: 9f277121039f7f5f4d42ed2450fecb1ca842675705c4d1ad8fe6c99b00ac2de8
font_01_sfnt_off0001040b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040B 10992 bytes
SHA-256: b8f0b4d1e8a15b9aa4c820f91cf271ce50c5b119183bfc2bc88d3b6403cc7653

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