Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7183aa0ace02fda…

MALICIOUS

PDF

73.0 KB Created: 2021-02-20 03:46:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: df4255531f57c4baa7e8ef42e3083370 SHA-1: e4d7fe5273adf0452dc1a443783736b8b12aa5b8 SHA-256: d7183aa0ace02fdae3bb0e2c562e4c8f23d3ba080b0f3cb1e4cd55a9d0b4385a
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, indicating a link farm or SEO manipulation tactic. Several URLs are flagged as malicious or unknown, and ClamAV detected it as a phishing trojan. The document body is heavily obfuscated, but the presence of numerous external links suggests an attempt to redirect users to malicious sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=how+much+do+trim+carpenters+make In PDF document text
    • https://zujanotoze.weebly.com/uploads/1/3/4/4/134476942/vojipaxufi.pdfIn PDF document text
    • http://velixone.66ghz.com/alimentacin_saludable_para_nios.pdfIn PDF document text
    • https://kakowafalajoji.weebly.com/uploads/1/3/4/4/134455686/5328227.pdfIn PDF document text
    • https://xevivipemasap.weebly.com/uploads/1/3/4/4/134481894/234bf62.pdfIn PDF document text
    • http://jowopejev.22web.org/angry_birds_transformers_old_version_mod_apk.pdfIn PDF document text
    • https://viwoseloza.weebly.com/uploads/1/3/4/8/134861971/4bce38715a6df29.pdfIn PDF document text
    • http://penimira.iblogger.org/quotation_word_document_template.pdfIn PDF document text
    • http://befigter.xyz/raxatixenukotedeledumh4ts.pdfIn PDF document text
    • https://jizufozerujit.weebly.com/uploads/1/3/4/3/134343201/97e4c9b61c.pdfIn PDF document text
    • http://com-signto2.xyz/calligraphy_letter_template719hy.pdfIn PDF document text
    • http://wdd13.ru/416868546512i66y.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/zobuwubedak/zanejotokuropegemuketa.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/35611789153.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/cloudformation_aurora_rds.pdfIn PDF document text
    • http://warufadul.rf.gd/15092885169.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/35503862377.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/behavioural_interview_questions_and_sample_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/3898453674.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_off0000e021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE021 5400 bytes
SHA-256: 36eb368f61c9ecdb3cddd095cce70af8e9af6cda80b9033fcca7a4e279542512
font_01_sfnt_off0000f25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25C 10804 bytes
SHA-256: 94e0111da97f46fb8f0e9790bda5d8b9a9aa67a34385b30a8bd73683443b4a46

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