Malicious PDF — malware analysis report

Static analysis result for SHA-256 136cceb33df0c126…

MALICIOUS

PDF

71.4 KB Created: 2020-11-13 07:21:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 9a95555cfd3cee293ce5b5379182b9d9 SHA-1: 12581802a15db4c1dfa9b88f985266d7ea6f4064 SHA-256: 136cceb33df0c1268bd20321f89f608d72d8ed392dbf1af5a16759ba41ac6da0
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/123?utm_term=frigidaire+professional+series+microwave+manual PDF link annotation
    • https://kipujoguburaza.weebly.com/uploads/1/3/4/3/134321983/4249929.pdfIn PDF document text
    • https://wemibevufiwoseb.weebly.com/uploads/1/3/0/8/130813314/takirak.pdfIn PDF document text
    • https://dowezepuxaku.weebly.com/uploads/1/3/4/4/134463959/70914.pdfIn PDF document text
    • https://vaputonusodi.weebly.com/uploads/1/3/4/4/134493057/78bafdc.pdfIn PDF document text
    • https://fategebedabeno.weebly.com/uploads/1/3/4/7/134718848/lanezo_xusuxuguwikati_raroviz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388833/normal_5fa5dfd41f4f0.pdfIn PDF document text
    • https://palidabelegofa.weebly.com/uploads/1/3/4/3/134316445/mepupazaxuxud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452154/normal_5fa14f8aac50a.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/mokuwanibof/acls_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/dalirujunegoxojirulov.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/84691128428.pdfIn PDF document text
    • https://s3.amazonaws.com/jaburirarov/78443607228.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/79540178956.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/dgr_crosley_racing.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000ecce.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xECCE 20608 bytes
SHA-256: 2b650232ab326a6f23443cae434b5ea39b61371a1254506223a6db7aa1848ad8
font_00_sfnt_off0000b7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F5 5584 bytes
SHA-256: 0e75d9365a2c5876ba00cee9f6ec353265570c49e1a5d1389baa4a8f2f6ad62b
font_01_sfnt_off0000cafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFC 9888 bytes
SHA-256: ccc3909a26a2ff5553b7eb5630cf14863b4ebc5d0736cf3e1c970a6b86828add

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