Malicious PDF — malware analysis report

Static analysis result for SHA-256 78021024a5094813…

MALICIOUS

PDF

67.2 KB Created: 2021-01-03 05:20:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1fb26472103741a410b3c5ab3581d0f2 SHA-1: c4f5f6b84cebfd8ece23024cdde0823b4182a589 SHA-256: 78021024a50948136412beae535de58d3bf6ba61b2087d0c962f3be6776087d3
156 Risk Score

Malware Insights

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

The PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'Dell server r740 datasheet'. The presence of numerous external links, including one to 'trafftec.ru', indicates an attempt to redirect the user to malicious sites. While no scripts were explicitly extracted, the PDF format can embed JavaScript, which is often used for malicious redirection or exploitation.

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=dell+server+r740+datasheet PDF link annotation
    • https://cdn.sqhk.co/sufipuxifemo/Temq5zN/giduxus.pdfIn PDF document text
    • https://tavifarexup.weebly.com/uploads/1/3/4/6/134611028/tedagebi_biwugavezug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421780/normal_5fdb7cd221557.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/pupori-tuditab-dexanifi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377697/normal_5f95d71613ed7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f836d3b8-9ecf-4f65-992f-38131138abb1/xunopimoganobidudaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/886d0ff1-845b-41d0-8499-02c936357e5a/kolbassi_casserole_recipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d30a1d5f-0753-4dc6-91e2-fb393ea7cf36/lunatenoxatit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/676c09da-46bb-4e8b-9a86-0f3f0df5a452/alien_attack_team_2_box_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0924f779-1015-4053-ad3a-4c33404f0eb0/manual_garden_tiller_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b10ede7f-a781-4553-9ae6-afa6207b14bb/73835812157.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/509b668c-1187-44d8-8f00-2bbd83c80bf2/bebuwoxodeg.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_off0000c91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC91D 5284 bytes
SHA-256: cb02d9eb39e2c0c0c93d1ce5ed42ac7655cfccdd8e5d43bbf0f0f6b287207a32
font_01_sfnt_off0000db20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB20 10848 bytes
SHA-256: 4f9114f36bce546e0eb38cad416e80ebdde00ff930b306592875355ee13f5e2f

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