Malicious PDF — malware analysis report

Static analysis result for SHA-256 22fdedb0adbef853…

MALICIOUS

PDF

68.9 KB Created: 2021-03-27 16:03:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0518b98a992328668bf76afcdc7eb398 SHA-1: bfb25dca9c61487b273e1a7dd3308663a138fcb4 SHA-256: 22fdedb0adbef853345db8ae2314ddbb543e03f3560aed97d77f0066379fabe9
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to academic content, likely to trick users into visiting malicious sites for phishing or malware delivery. The presence of external URIs and link farm heuristics indicates a strong intent to redirect users to potentially harmful content.

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://bologen.ru/award?keyword=introduction+to+biometrical+genetics+pdf PDF link annotation
    • https://gonotelavekufuf.weebly.com/uploads/1/3/4/6/134615299/visusogu_duguxiketupupa_parovawar_foronosoviz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365634/normal_600fdb3503d53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378167/normal_600c9b76782fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489586/normal_601ba55fbbbdf.pdfIn PDF document text
    • https://vavulawukuret.weebly.com/uploads/1/3/4/6/134690424/gifepebatumij-pogejilozezi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480393/normal_60085cd2c6dbd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389820/normal_5feed8d5ed156.pdfIn PDF document text
    • https://dafalozurevibi.weebly.com/uploads/1/3/4/3/134308304/3609887.pdfIn PDF document text
    • http://nemuzem.iblogger.org/94943692485.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421366/normal_5ff01631cffc3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390381/normal_5fec1a5af1713.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kewevagisugimuw.onlinewebshop.net/ginajadefalijutowu.pdfIn PDF document text
    • http://falariwupap.myartsonline.com/55144278443.pdfIn PDF document text
    • http://mogedolexit.rf.gd/faxedufegusosefugep.pdfIn PDF document text
    • http://zopuraxikesu.epizy.com/aristokratsko_stopalo.pdfIn PDF document text
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_253bc71c20b54a73aebc8deb615ae2e4.pdf?index=trueIn PDF document text
    • https://b2fc43c4-60ab-4dc1-a1c8-84833fda4e2a.filesusr.com/ugd/37321e_7c30bc872e3a46949a1c707d560815d6.pdf?index=trueIn PDF document text
    • http://bawofifudip.rf.gd/jalepefilofazeligeba.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D6 5436 bytes
SHA-256: 61b8e5f5c1bd08d61421db7924a18510df04d08db6f322c5589a2b9e38025254
font_01_sfnt_off0000d728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD728 9624 bytes
SHA-256: ffc83dab90d3ce894918ecbfc37ac1dcaca6efa1031c1a10536e87901fc93253
font_02_sfnt_off0000f823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF823 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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