Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7765aab183f32da…

MALICIOUS

PDF

73.9 KB Created: 2021-01-06 11:04:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d73c426da7161b386cbac8925c1719a6 SHA-1: e92acf3957838fc3d0ddbeac2f5b80532fbdcb62 SHA-256: b7765aab183f32da95684a6abe87e86ebf66aba9eee03ac5deebd363b13e2968
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, with a critical heuristic identifying it as a PDF link farm. One of the primary external URIs points to 'traffking.ru', suggesting a malicious redirection or content hosting. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier output of 0.9998 further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate an attempt to redirect users to potentially malicious content.

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://traffking.ru/123?utm_term=walter+kaufmann+nietzsche+philosoph+psychologe+antichrist PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368244/normal_5f8866b3092ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420903/normal_5fe78a9779e0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403260/normal_5fab04d1e7a81.pdfIn PDF document text
    • https://bogatogofaz.weebly.com/uploads/1/3/4/7/134705351/38c86263.pdfIn PDF document text
    • https://mimitokiwunas.weebly.com/uploads/1/3/4/0/134012498/183d7ba9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479436/normal_5fac05bc611eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413967/normal_5fe26b66c1d6e.pdfIn PDF document text
    • https://jopalezaleloloj.weebly.com/uploads/1/3/1/3/131380469/vofakesaze-molewirez-wevexi-dodesufiten.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416151/normal_5fe7a8e5cc10f.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/selivuvumepaveb/uc_browser_java_jar_phoneky.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3985399-c641-4e3c-a47d-d75b7e79c2ab/mortal_kombat_11_wallpapers.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/ruxaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd196cde-327b-4313-ba66-4b55f3e75656/44980493822.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/99432354553.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_off0000e19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19D 5656 bytes
SHA-256: 8a08b3d61422e6efaba3b2fe8f09a2a1e950e332c2cf4d1baad9510bf0f0f39b
font_01_sfnt_off0000f4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DA 11328 bytes
SHA-256: ca7cf53cc6932b176e229adb7e23131cd2df133b460da1cf3cf79119f6ae9b1a

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