Malicious PDF — malware analysis report

Static analysis result for SHA-256 736efc51c24b225e…

MALICIOUS

PDF

73.9 KB Created: 2020-12-07 22:30:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: bb64fed723fc7d454729c43a8c05e7ed SHA-1: bb99b085640c2d7219248a91b0136cb2b015d15a SHA-256: 736efc51c24b225e8217186e803c993fd4ba7b61856dadcb6ced731a4dc98bf8
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to manipulate search engine results or redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=mendelssohn+songs+without+words+op+67+no+2 PDF link annotation
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/c0fcd04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495040/normal_5fb412df4aa8c.pdfIn PDF document text
    • https://jazediwugitali.weebly.com/uploads/1/3/4/7/134730671/jowow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414689/normal_5f9fe53b3e307.pdfIn PDF document text
    • https://mapipuluzobeb.weebly.com/uploads/1/3/1/3/131398440/575574.pdfIn PDF document text
    • https://buwabasowo.weebly.com/uploads/1/3/4/3/134353515/nejezabanok.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/76b444e4-6a9a-496b-bf27-cb91362f88e6/mafefarilopasig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/247f8a2b-cb5a-4422-aa32-6afa28b2183d/1768965468.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/257b75f6-912d-4a93-a5d9-e838aa706322/nevenenopejigivexore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77cd4558-44ab-48e4-adc4-0e1a550fee02/88211387948.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/sininofixabonowutibilimik.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/begimejopujufugosow.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c6a4a87939686407af5f/t/5fc1f47be18c5c478e4178cc/1606546558360/the_french_angel_height.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c4a4545-6b74-4770-b7ba-726bddda3f46/puxopewuliturakutodoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b217312a-ea90-48c0-85ef-43f0e7d90b34/93965777229.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d33427a199023ab4f616/t/5fc3d4a19b1ed03538528c4a/1606669474047/luxew.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_off0000cd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD71 5472 bytes
SHA-256: e91b7e515b9fb320954a80311167d1d4e3cddec6a958583f5607cfd038a92c08
font_01_sfnt_off0000e02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02D 10956 bytes
SHA-256: 2d4536d51e7cb6cbe2b0bb86c9fef0db5e48cad0e440a85b817130b66e9e1fc5
font_02_sfnt_off0001051e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051E 16120 bytes
SHA-256: 2cfc97915d250804213c9b0e6ad261e0979cd38371fb36ec9174dea58a153a3e

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