Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5e7ac581df09e1…

MALICIOUS

PDF

73.6 KB Created: 2021-02-16 03:52:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b64006cf12468de18fb133d0e38bf834 SHA-1: 376f1a3dfdb371a73026032270a24ed8c2967df8 SHA-256: 8a5e7ac581df09e15bdd3d3f10a85f6012f9c9a975a306a2a5c6697dd1384c3b
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically designed to appear as a download link for beginner mobile development books. This link redirects to a disposable hosting domain, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jottigo.ru/strik?utm_term=mobile+application+development+books+for+beginners+pdf PDF link annotation
    • https://visofebofoxofub.weebly.com/uploads/1/3/0/8/130814652/misofaluzonigeli.pdfIn PDF document text
    • https://livuwijonirib.weebly.com/uploads/1/3/4/7/134732661/tupikikavizetikit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491933/normal_602a85534af8c.pdfIn PDF document text
    • https://bugupomulu.weebly.com/uploads/1/3/5/3/135396692/kopesaxeb.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/jihjg3n/gcc_bookstore_az.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475988/normal_60270bebba52e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427104/normal_602143ffb2ebc.pdfIn PDF document text
    • https://rukuzidin.weebly.com/uploads/1/3/4/5/134517246/gosorerexol-jaguvoxara-xumixuxavif-zetofipaxaba.pdfIn PDF document text
    • https://fotewusobowo.weebly.com/uploads/1/3/5/3/135339642/2dbb2c1.pdfIn PDF document text
    • https://cdn.sqhk.co/rifusofuwedi/ieidblH/11081218914.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kafises/xixagum.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/wanomip.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/pythagorean_identities_practice_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/7_little_words_answers_puzzle_13.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/sotinusokipivadero.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_off0000df46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF46 5744 bytes
SHA-256: 4fd6cfd4f96c1fbe1dbd2310bb0ad5a6898335b3e229fd2562caad8f3af90546
font_01_sfnt_off0000f2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D4 10700 bytes
SHA-256: 91d577f94d2541b90d5ac6a26eea8c7214dd020728ac6a035428fd8caeac517b

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