Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2a57c7c3aa79019…

MALICIOUS

PDF

63.1 KB Created: 2020-11-18 14:33:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 73d88cb9cb29de83cb0f33f9f75d6655 SHA-1: e63a7c8f99434f6499a3cc8b25e3a60cf9a6c747 SHA-256: c2a57c7c3aa7901911f4e0100c9523a67ec90e16f016d9b4e85b2d1d8a3bb47f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links pointing to various disposable domains, identified as a link farm. This behavior, combined with ML and ClamAV detections, strongly suggests malicious intent, likely for SEO manipulation or to distribute further malicious content. The presence of numerous external links and the PDF_SEO_LINK_FARM heuristic indicate a pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://trafffi.ru/aws?utm_term=moses+basket+sheets+ebay PDF link annotation
    • https://wosowabo.weebly.com/uploads/1/3/4/3/134340570/lavemumivaxumaxodix.pdfIn PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/kozux-xuxugiseri-venekamebelap.pdfIn PDF document text
    • https://kileligujet.weebly.com/uploads/1/3/4/4/134457719/99c4ab64de44f41.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/6583597.pdfIn PDF document text
    • https://baresifesej.weebly.com/uploads/1/3/4/1/134131831/4c2fe455eab22d1.pdfIn PDF document text
    • https://benaputilog.weebly.com/uploads/1/3/4/7/134707665/195376.pdfIn PDF document text
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/lafomu-fowesutom-dabikituduxun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374199/normal_5f89e167794dd.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/jamokaroxoj/xidesit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/132da228-07f4-4279-b170-1aa1a5d66d66/love_and_basketball_full_movie_onlin.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/63262523309.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/190e5a35-d615-46d5-badc-b232460e8046/74987317351.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/beginner_guitar_lessons_book.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7BF 4956 bytes
SHA-256: d48c9c0c5bed5a4134e9c50a9e96370890f69778b93c0e865188810ae3cfe6d3
font_01_sfnt_off0000b8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B3 9936 bytes
SHA-256: e1cb74f017347f7b012c7d4e5d08636fde0762df7035069411be0f83e0b3171d
font_02_sfnt_off0000da61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA61 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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