Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8328ee768411f0a…

MALICIOUS

PDF

68.1 KB Created: 2020-12-26 19:12:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: cdd203a16b4869d786a42cbc931f10b4 SHA-1: 78d1e8f5104f8739b06adb54778e5d28c2806be0 SHA-256: b8328ee768411f0a22343a321728d932e4f023accef0124b90e36cc723ac2259
156 Risk Score

Malware Insights

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

The sample was identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, with one heuristic specifically flagging it as a 'PDF_SEO_LINK_FARM'. The primary URL, 'https://traffnew.ru/123?utm_term=st+stanislaus+catholic+church+modesto', suggests a potential phishing or spamming campaign. While no scripts were explicitly extracted, the PDF structure and the nature of the links point towards an attempt to redirect users to malicious or deceptive content.

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://traffnew.ru/123?utm_term=st+stanislaus+catholic+church+modesto PDF link annotation
    • https://cdn.sqhk.co/nivipanevi/jiwjj5m/84790837382.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369334/normal_5f95e8278aafa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452834/normal_5fb71438b20a1.pdfIn PDF document text
    • https://kedosesu.weebly.com/uploads/1/3/4/8/134853013/lovonabutubiduj.pdfIn PDF document text
    • https://cdn.sqhk.co/wepenujofow/oEtgfaW/mini_golf_100_level_30.pdfIn PDF document text
    • https://gabejopow.weebly.com/uploads/1/3/4/5/134597712/datefod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365660/normal_5f87c62b7227e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464065/normal_5fd6837f5f9e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458125/normal_5fa4cc4daff3b.pdfIn PDF document text
    • https://gefelamanak.weebly.com/uploads/1/3/4/3/134353999/508b77b0.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/rixevozajixezos/63206647896.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/55891091412.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/subivobegepafefozite.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/lavupowejideb.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_off0000cddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDF 5284 bytes
SHA-256: e762d368dc349897267fe68108eb8e1473c12166489edcc3a7f4bfffec899171
font_01_sfnt_off0000dfa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA4 10588 bytes
SHA-256: 940db6cded1a13e9200cb36b717137c0488b814680e9e6e5e270950b0daac0c8

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