Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f57ed0f2185e87e…

MALICIOUS

PDF

67.0 KB Created: 2020-11-23 11:05:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d3b8293316398ff3e5bdffbbf8a793c3 SHA-1: d89a0462fe4b5258e2acc5c1fbb528177c4cce08 SHA-256: 3f57ed0f2185e87effe6b3730ef208a69b7e1e7f3936313d50d2dbe8dd444dae
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 0.9997

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://trafftec.ru/123?utm_term=stardew+valley+maple+tree+spacing PDF link annotation
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/kasodopizafazakoxuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384295/normal_5f8dcf7f03e76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377391/normal_5f8a2f2db1b9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415526/normal_5f9da64de8832.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367617/normal_5f8be3c18510e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372076/normal_5f9651a231ee0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367941/normal_5f9a64fbc07f0.pdfIn PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/papozamijul.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/c2dc1004-fcc7-4c08-9f38-3b0fc8d99014/776_area_code_mexico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1375a11-9564-4e16-9e6b-ea575f9c55ab/zaman_zaki_taji_qawwal_mp3_free_down.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a411e367-a07d-485a-9e68-6ae81e062823/brittle_deformation_geology.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_off0000c8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CA 5752 bytes
SHA-256: 0c64012314de84cd80809c3938a21d1a12fec91c9ee3d3a3110465059a09d2be
font_01_sfnt_off0000dc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC65 10284 bytes
SHA-256: 256bae615fbf3f653ce14ac313f2aadfbe59120005979b4077445c5163815ad7

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