Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c7848379aab1a62…

MALICIOUS

PDF

84.0 KB Created: 2021-05-27 22:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bce4a566744efb9c88647bff3aa07019 SHA-1: 9d411d8471b71d33f033d84ee9d1f239dc9bf136 SHA-256: 7c7848379aab1a628629a06cc17c8c29098eda526fae0740d47112c1bf8540e4
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-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://druttle.ru/123?utm_term=cal+king+platform+bed+ikea PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4484605/normal_5fce54ff3fc8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420767/normal_604673dcad216.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481062/normal_601132da285bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372955/normal_5ffd3acc3e3ec.pdfIn PDF document text
    • https://tanuroxej.weebly.com/uploads/1/3/4/1/134131309/3310804.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459628/normal_604843a8b960c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417543/normal_6011742b94902.pdfIn PDF document text
    • https://redumufisinuf.weebly.com/uploads/1/3/1/6/131636648/zobezirijazis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379032/normal_5fdeda9201035.pdfIn PDF document text
    • https://kofiwesufe.weebly.com/uploads/1/3/4/7/134748014/mivaburaxovuparidanu.pdfIn PDF document text
    • https://fiwazapabuw.weebly.com/uploads/1/3/4/3/134357015/9ce13c08fd23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426679/normal_60431d72547e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462344/normal_603105bd7d90a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495043/normal_601a2a016458f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c18c088-085e-4684-b77a-f59b37c5fd04/lg_tromm_washer_wm2277hw_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69564cef-e74d-4cd9-8e8e-da868f574256/how_do_i_reset_my_garage_door_sensors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12229125-153b-4e84-b107-9dc42f433f8f/28089811215.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dfe757c-e518-4474-a470-b4b82b501587/how_to_report_cohens_d.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d57f899-93f4-4db6-8c49-0b6977d8791f/how_to_change_time_on_pioneer_deh-1100.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_off00010a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1B 5292 bytes
SHA-256: fd043b637656021a1ca7bb0b57ab2617c022c89179da73eb0c28cd833f6ee977
font_01_sfnt_off00011bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFE 11684 bytes
SHA-256: 2f2f7f8bfcabdf237a5c9ce61abb5eae6ef6da68307d59a23efa1536e3c87ec4

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