Malicious PDF — malware analysis report

Static analysis result for SHA-256 3db4ea0060a5d558…

MALICIOUS

PDF

79.6 KB Created: 2021-03-14 20:17:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 89611cf69e5d77545a1e243429b729da SHA-1: d98aeffe236f7ac57dc494b29b3f9c01a0eff78b SHA-256: 3db4ea0060a5d558a50b47d75cf2ce5737bf4d176281b322e471dec234babfbc
186 Risk Score

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 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://xajibur.ru/123?utm_term=makalah+sumber+daya+manusia+pdf PDF link annotation
    • https://xisagoruno.weebly.com/uploads/1/3/5/3/135332800/b4f52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485939/normal_6047b8f221edc.pdfIn PDF document text
    • https://beburasitowetu.weebly.com/uploads/1/3/0/9/130969608/d5fe428a.pdfIn PDF document text
    • https://ramageputa.weebly.com/uploads/1/3/1/6/131637054/pekumezexagapoka.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501789/normal_60082afb77ee8.pdfIn PDF document text
    • https://nalivugubogepa.weebly.com/uploads/1/3/0/9/130969323/pozovifura.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474992/normal_5ff76403b5580.pdfIn PDF document text
    • https://lezogifivejuz.weebly.com/uploads/1/3/2/6/132682585/9559735.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417818/normal_5fe60fe3863cb.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/72a8eeb4-2e6c-41e7-92ad-79fc2f182ba5/army_operational_terms_and_graphics_cheat_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/741937f5-630c-489f-95c5-3141e1f6c1ce/48346347778.pdfIn PDF document text
    • https://677f84e8-2a3b-482a-8721-58d714100356.filesusr.com/ugd/086aec_684297019f3744deae471e055f7aa927.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b14bca95-b878-4ab0-a105-4ea0ebff8998/75210913630.pdfIn PDF document text
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_9b84e72bbaba400b8bd2221ebf685303.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4064975c-b4f5-43e0-b905-3f4b8ee809cf/7034910502.pdfIn PDF document text
    • https://cf587a47-7c2f-4f55-8bbb-21a4c73503f7.filesusr.com/ugd/8ea597_f865ffcdc276421ea0a6c33a0753f7d9.pdf?index=trueIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_99d62c3701844d0fa838fa0a1adf488f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/029c27ba-aec1-4035-94d2-4282092b357f/52268109247.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d719e328-7a6e-406e-81b3-d9314ee8c964/gixunaperajajusukikorata.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dbae2c5-c010-4a85-be8d-a86fa1428942/basoliseke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c67630e-288c-4919-94bb-704b4e203b0e/buxurejuvix.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_off0000fbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF3 5592 bytes
SHA-256: 3f09e7e30ab4cfe973d74c87827be02f33f94dfd66856ab2fb4fac6aadd12585
font_01_sfnt_off00010ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED4 10048 bytes
SHA-256: 84beae5a5e5f157e8c5c44e4da0182b55a876e385979f3f9d04d2e83aade15c3