Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45f48db8b628bab…

MALICIOUS

PDF

69.3 KB Created: 2021-01-06 09:39:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: bdacc346b6a4d43184ee3eb9f37e45cd SHA-1: 7a41f3985d7b79370d72905a35afdf7315de78df SHA-256: a45f48db8b628babf10ba44f09e292c1d1ea9f5c872aec5fa969ce1f5e82272d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, indicating a link farm or SEO spamming technique, with one prominent URL being https://trafftec.ru/aws?utm_term=realidades+1+capitulo+1a+answers+page+13. The document body is heavily obfuscated and appears to contain metadata related to its creation by wkhtmltopdf, suggesting it was programmatically generated rather than user-authored content. No scripts were extracted, but the presence of numerous external links and the malware detection strongly suggest a malicious intent, likely to redirect users to phishing 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://trafftec.ru/aws?utm_term=realidades+1+capitulo+1a+answers+page+13 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380545/normal_5fbdbab3a4770.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424364/normal_5ff0d9372b928.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390996/normal_5f9c7d801edd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369518/normal_5f97e556582ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408990/normal_5fa7273c9f23a.pdfIn PDF document text
    • https://zuzedunili.weebly.com/uploads/1/3/4/4/134460484/0e88ed56dc71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368481/normal_5fa2b11f117b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382974/normal_5f8c726fa351b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417221/normal_5fbd1b7f917fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_5f945d7c8967b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374968/normal_5f95f0db73430.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/wunupalezozerud/building_algorithmic_trading_systems_a_trader_s_journey.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/pagixutanasuregejezitog.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/vipuvitometekuximum.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_off0000cef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF7 5556 bytes
SHA-256: b6d431b36e96a1a2c8deb6b7ace6d4a0af03df57f1dd82c0d010b5c62b4ee1ab
font_01_sfnt_off0000e20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20B 11584 bytes
SHA-256: 1ee06505193fbd3ee052fee127aa07b0cfdbe40614be72b0523be39abf263bf7

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