Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c2c50d8520aa16…

MALICIOUS

PDF

70.2 KB Created: 2021-04-06 09:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 18915772e5f58e2d1dbdf204e5d5b15a SHA-1: 898ca4f586016c117fe615c015275e922a5c06e8 SHA-256: f8c2c50d8520aa16681fe5cfa009c61866ba2039f3a21f6647d04865bd2579f2
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://mezovuduw.ru/wix?keyword=tfd+supplies+reviews PDF link annotation
    • http://valilep.iblogger.org/jovokujotudidurujixeziw.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/baldi_s_basics_camping_demo.pdfIn PDF document text
    • http://mafejaruvoje.sportsontheweb.net/73129195394.pdfIn PDF document text
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/pijimirepatu_fidegafim_kunenutixafej.pdfIn PDF document text
    • http://pidoxabomekoju.iblogger.org/reliability_and_validity_in_assessment.pdfIn PDF document text
    • https://sojujigun.weebly.com/uploads/1/3/0/9/130969910/wetamevedegezilek.pdfIn PDF document text
    • https://kikitepolo.weebly.com/uploads/1/3/4/5/134514310/revedabu.pdfIn PDF document text
    • https://zewijevatijafat.weebly.com/uploads/1/3/4/2/134265582/xusixil.pdfIn PDF document text
    • https://jajujawu.weebly.com/uploads/1/3/0/8/130813132/tojirojiresofe-xuweluzive-gewus-kugifebobekomu.pdfIn PDF document text
    • http://majovevalaji.sportsontheweb.net/59721009956.pdfIn PDF document text
    • http://mozobadijoba.medianewsonline.com/49275951908.pdfIn PDF document text
    • https://kuxilididid.weebly.com/uploads/1/3/4/3/134387830/4062071.pdfIn PDF document text
    • https://nurerimufiwovu.weebly.com/uploads/1/3/4/3/134394752/gikof.pdfIn PDF document text
    • https://sazunanul.weebly.com/uploads/1/3/4/4/134488017/1500429.pdfIn PDF document text
    • https://roboxojepuz.weebly.com/uploads/1/3/4/2/134235986/mopuvefinusawebox.pdfIn PDF document text
    • http://bibuwobu.22web.org/sofufafukelimavodo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuvamawijivef.atwebpages.com/7168254243.pdfIn PDF document text
    • http://vuzoziwulof.epizy.com/11332307840.pdfIn PDF document text
    • http://bojidalukin.epizy.com/zisaxesu.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/roland_barthes_mythologies_sparknotes.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/photo_editor_blur_background_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/pinup.pdfIn PDF document text
    • http://sujotoginejo.rf.gd/spiderman_2_pizza_theme_bass_boosted.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/manual_basico_primeros_auxilios.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_off0000d470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD470 4928 bytes
SHA-256: aaf5a7b041cace4e0fc07d65f400086d7f53d2814d0709717c064729ddb696cb
font_01_sfnt_off0000e55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55C 10644 bytes
SHA-256: fed21eb248baab8ce69fea03bab44fddcaa928c52c876b0b91836da589bc7494

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