Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dbe989d1dd902dc…

MALICIOUS

PDF

113.9 KB Created: 2020-11-28 17:32:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3d35533728bf867718b3253563ac24cb SHA-1: de5e156f5d1a4d8059558e33b421ba04da59ac47 SHA-256: 2dbe989d1dd902dc27316448ac544d30edcca40010771c26f82b2daf3477cbc3
186 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 0.9995

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=teenager+table+quiz+questions PDF link annotation
    • https://bitoxusimafitaj.weebly.com/uploads/1/3/4/3/134311342/2111876.pdfIn PDF document text
    • https://xajoxivanuxus.weebly.com/uploads/1/3/4/4/134432241/4215235.pdfIn PDF document text
    • https://tajekuludukomas.weebly.com/uploads/1/3/4/4/134498487/todolanavinu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428078/normal_5f9f31e534d47.pdfIn PDF document text
    • https://boleturem.weebly.com/uploads/1/3/4/3/134398498/a19e51c8ca53e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384295/normal_5fbb162c2148d.pdfIn PDF document text
    • https://doleroxewaforud.weebly.com/uploads/1/3/4/3/134322791/vanekagaba_zatowolorikom_lazakodobe_mejot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367017/normal_5f9145ec2877f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425214/normal_5fa8c9aa35b76.pdfIn PDF document text
    • https://meporolokiso.weebly.com/uploads/1/3/2/6/132681401/ruvudutodixer.pdfIn PDF document text
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/gegibonupava.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jojitagifuva/auto_race_tracks_in_missouri.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EE3 5000 bytes
SHA-256: cda3254dd5cac7285ec423ff5691275c5a6917d82f3fdd808d80c8ba25825695
font_01_sfnt_off00016ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FF2 11520 bytes
SHA-256: 742c65dc367496ef788c1224d296ce4141bbeae08d93c86166c58051ba372faf
font_02_sfnt_off00019744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19744 16176 bytes
SHA-256: fe368a7e11ecfa6193da87178d86506fb6103a7d44d24329115a38a86893740f
font_03_sfnt_off0001ac5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC5A 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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