Malicious PDF — malware analysis report

Static analysis result for SHA-256 a110a424532da1b3…

MALICIOUS

PDF

76.0 KB Created: 2021-02-21 07:05:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: dcb0d45afc8b6a422b7d21441090c6eb SHA-1: 94bb094ab77a632f8cd89bd2de9593ea4cac5d82 SHA-256: a110a424532da1b3dc3020faae401e3600b2061ae4dc08bb94c899f38dbdf1f7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'link farm' designed to boost SEO. The document body, though heavily obfuscated, contains text related to weight loss and yoga, suggesting a lure. The presence of ClamAV detection and ML classification strongly indicates malicious intent, likely to redirect users to malicious sites or download further malware.

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 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.
  • 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=can+you+lose+weight+and+tone+up+with+yoga PDF link annotation
    • http://hayatevesigar.online/91697621739xkzd0.pdfIn PDF document text
    • https://zujomesesewega.weebly.com/uploads/1/3/4/9/134902804/e25127f588c4.pdfIn PDF document text
    • https://dibapanapuro.weebly.com/uploads/1/3/0/7/130776085/5188377.pdfIn PDF document text
    • http://kopawaruda.22web.org/55547427326.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/vizegemawokaxe/linux_android_emulator_kvm.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/wezazoxew.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/professional_powerpoint_templates_free_for_thesis.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/913329364.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/rivozuda.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/tananamubemiwep.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/jotozumibanidegaxutelada.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/combinations_and_permutations_worksheet_answers.pdfIn PDF document text
    • http://bojefej.epizy.com/solitaire_cube_classic_cards_apk.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_off0000ed92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED92 5224 bytes
SHA-256: 1cc1da448ecdd1f5ccb7c1f1f058b573b42477a7a3944cf0dd3dc80e00bc98b5
font_01_sfnt_off0000ff70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF70 10392 bytes
SHA-256: ca8756d3f914806b70cd9d797a937fc17d6eb9d0e7e720f1f680d101d429bb2c

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