Malicious PDF — malware analysis report

Static analysis result for SHA-256 de87d4f3bc557bbe…

MALICIOUS

PDF

80.3 KB Created: 2021-03-07 22:49:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e37df01bc87e75d1de2957d91c83fbd2 SHA-1: b7487761ece2930b817cf8da778757017517f08e SHA-256: de87d4f3bc557bbe103cbd8f048d28bb0bdbaddd70b334fe29734ead48ff9722
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. These links point to domains that appear to be used for SEO manipulation or potentially hosting malicious content. The ClamAV detection and ML classifier also strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/wix?keyword=the+last+stand+union+city+cheat+codes PDF link annotation
    • http://bigmagazin.xyz/how_do_you_intend_to_keep_your_relationship_strong_and_healthyt3f3n.pdfIn PDF document text
    • http://8gusevshop.space/64469054160regju.pdfIn PDF document text
    • http://good-production20.site/tuwopoputuzonusaxukokodoj1smzh.pdfIn PDF document text
    • http://tamakar.tech/92610167331jdjd0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2a497570-3881-454f-aefc-229a18bbdf22.filesusr.com/ugd/83e24f_c260bd79e29d48609ee26f6b0c59f4f8.pdf?index=trueIn PDF document text
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_9cd979d0bcea463f92fa7235711f46c0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/sofuziti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edc635b4-b548-4069-9c55-c5b1910e88ea/1st_grade_handwriting_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/25889741480.pdfIn PDF document text
    • https://aa4c2489-c93b-4667-afab-104bf5323bad.filesusr.com/ugd/8b49c6_6832e15a0c304099a9373d0739aa088c.pdf?index=trueIn PDF document text
    • https://78bdfa25-736e-4945-a764-db21511aacb9.filesusr.com/ugd/9bd82e_7b617a9be11d4886939f7cd4bccddd56.pdf?index=trueIn PDF document text
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_f47558aaee7e43cf8cd8ef2d195dedba.pdf?index=trueIn PDF document text
    • https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_52181c25d90b406d96ccd0b3b467ad68.pdf?index=trueIn PDF document text
    • https://fc060a1e-8c1d-4b7d-bafd-75f79d4c6355.filesusr.com/ugd/c0a468_6f8b47e8e61241fcb708a5d63ce4cddd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a245a539-91c3-4c2a-8a12-98769886eba4/federal_rules_of_civil_procedure_service_of_interrogatories.pdfIn PDF document text
    • https://667b589a-70dd-4c78-a03f-47f6e9f07b1f.filesusr.com/ugd/db80c5_88330f0d1aa0423f9ee7b6f35e1c9ba2.pdf?index=trueIn PDF document text
    • https://c546c886-5aa5-41cc-813f-4ed3e146772c.filesusr.com/ugd/b3e52d_0115b32fe1964c9aaf6c407096652e70.pdf?index=trueIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_326d3a1394c5473d88f10a16b0ab4cd6.pdf?index=trueIn PDF document text
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_82cf8f31f1db4e77b5950080f8c90da6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazemi/jewoboxadexozuzevapamut.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/360_antivirus_for_laptop_free.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_off0000f3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AC 4980 bytes
SHA-256: db4e3d088c824abbb6ee3815e80e18fa8684dc2c7778a5b5f136e9eb0a5f544c
font_01_sfnt_off000104a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A2 15240 bytes
SHA-256: 932be4ccf8c1faf1466049391e0b2d12e4e5dc9c99fd80cdeb69734663b9f007