Malicious PDF — malware analysis report

Static analysis result for SHA-256 b816197d232562d2…

MALICIOUS

PDF

70.1 KB Created: 2020-12-20 07:45:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ef7c9d46800668ea29c302fa4d4b61b8 SHA-1: d3bb3ceaf7432b2ee59cc4f4973096438e0c82f6 SHA-256: b816197d232562d2b01f73368002a746835fe7eac9d7de596e86264a47c0ce69
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. One of the primary URLs, 'https://trafffi.ru/123?utm_term=guide+to+safe+scouting+shooting+sports', appears to be a lure. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, with 'https://vajugape.weebly.com/uploads/1/3/4/7/134767319/33c2de450.pdf' being the first identified. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/123?utm_term=guide+to+safe+scouting+shooting+sports PDF link annotation
    • https://vajugape.weebly.com/uploads/1/3/4/7/134767319/33c2de450.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450257/normal_5f9f6d976ccbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418399/normal_5fb9825c1d46b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424405/normal_5fb548a065116.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427498/normal_5fc752ec3f4ad.pdfIn PDF document text
    • https://basivukapipex.weebly.com/uploads/1/3/4/5/134528325/1013698.pdfIn PDF document text
    • https://mikofamix.weebly.com/uploads/1/3/4/8/134882663/mogewa.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/wunojipu/what_is_pitch_in_music_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/matexuxorazazoxax.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/selp_helf.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/green_revolution_in_india_essay.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/case_in_point_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4ad4858-35d5-48b3-a420-adbef78c55f8/ganezarevedejugesogu.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_off0000d568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD568 5416 bytes
SHA-256: b977791a3a4ad6885e75064d1bf654c9e35bf60d081983cc0068209ec122c2c5
font_01_sfnt_off0000e7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D7 10484 bytes
SHA-256: 7bcca1fa4d6e214c8344db592d43e0af1aaa5ef125fb5ecf61118ce01faf7ed1

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