Malicious PDF — malware analysis report

Static analysis result for SHA-256 09d85921859e4b1e…

MALICIOUS

PDF

61.3 KB Created: 2021-01-14 01:56:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3070de3372934ac71c1db9c536f0c4bc SHA-1: 4b1ec881fa8e112c058be498d613b9d678619f47 SHA-256: 09d85921859e4b1e8a26083a32d8cedf4f1814dcdf961e54b504916d97a147c2
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, suggesting it is part of a link farm designed to drive traffic to various websites. One prominent URL, 'https://traffnew.ru/wb?keyword=urdu%20naat%20mp3%20ringtones%20free%20download', indicates a lure related to free downloads. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffnew.ru/wb?keyword=urdu%20naat%20mp3%20ringtones%20free%20download PDF link annotation
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/popefonu.pdfIn PDF document text
    • https://nabusaguvelono.weebly.com/uploads/1/3/4/0/134095838/sukalogerisaz-pedes.pdfIn PDF document text
    • https://jozokuxig.weebly.com/uploads/1/3/2/8/132814463/tukikirigimu.pdfIn PDF document text
    • https://site-1171473.mozfiles.com/files/1171473/26369504801.pdfIn PDF document text
    • https://mosuzikovadapa.weebly.com/uploads/1/3/4/6/134667275/8387798.pdfIn PDF document text
    • https://xuxufagitagagi.weebly.com/uploads/1/3/0/7/130740521/f75a70b6a0b16a.pdfIn PDF document text
    • https://duzebovad.weebly.com/uploads/1/3/4/3/134316699/vexumifelow.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/napisakaluja/kadofir.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/niredikovewojarenugupa.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/devibijupoju.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/sidajegebagij.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/nctb_ebook_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/84562156764.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_off0000b3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E2 5608 bytes
SHA-256: f99fc4266ebff1e636f9010c359e47690fc00dade154b4b06e94b3b4470203ae
font_01_sfnt_off0000c6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F7 9936 bytes
SHA-256: f957ac67b407c298af09cce57892bfa3307be1dc0a792d9cfb994b258198581d

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