Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e1e12fe6c6d2e14…

MALICIOUS

PDF

79.5 KB Created: 2021-03-31 07:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 50e91ea25f1ade28cb9e5eef9a98f5d4 SHA-1: 568acf4e2b7035d99f6da04eb2a871245e616f24 SHA-256: 8e1e12fe6c6d2e144451d049293aee4b4cc5dcf81178e050769c5e704a6288db
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://fokemale.ru/123?utm_term=blender+2.+8+course+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417999/normal_603140fa543e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454679/normal_602ab99f21d52.pdfIn PDF document text
    • http://palupalukagu.mygamesonline.org/pokemon_tcg_online_iphone_reddit.pdfIn PDF document text
    • https://riwumoba.weebly.com/uploads/1/3/5/9/135965326/2e0cb3850066946.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417145/normal_603977e04de41.pdfIn PDF document text
    • https://sokamokijajupi.weebly.com/uploads/1/3/5/3/135348419/7808393.pdfIn PDF document text
    • https://kofagegupuk.weebly.com/uploads/1/3/2/3/132302723/834d0213.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385636/normal_5fd09441c44b9.pdfIn PDF document text
    • https://bezofaxifi.weebly.com/uploads/1/3/1/6/131606652/paberute-zezokawizus-xasigonijis-rivegexisulob.pdfIn PDF document text
    • http://rupazaduxil.mywebcommunity.org/gowarugunuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426073/normal_60316ea319c4d.pdfIn PDF document text
    • https://turazuxutanuv.weebly.com/uploads/1/3/1/6/131606798/6cbf834b.pdfIn PDF document text
    • https://mapetafuje.weebly.com/uploads/1/3/2/7/132741207/d57d38ab952617f.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/pozokimepe/building_information_modelling.pdfIn PDF document text
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_2f0081080a0346dda7ba0f759d348d29.pdf?index=trueIn PDF document text
    • https://b2fc43c4-60ab-4dc1-a1c8-84833fda4e2a.filesusr.com/ugd/37321e_e2ba32892f8d47239b41de6728fc4c70.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zikeko/balanced_scorecard_definition.pdfIn PDF document text
    • http://gitodake.myartsonline.com/wopumovabofexi.pdfIn PDF document text
    • https://6090ae5c-070c-4b50-bfd2-11a66789f099.filesusr.com/ugd/83cce3_eaa1641a9aec481da016cd65a6532712.pdf?index=trueIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_3359c41ea2924a30b80300a06780163f.pdf?index=trueIn PDF document text
    • http://luxupuxud.myartsonline.com/101_creative_problem_solving_techniques.pdfIn PDF document text
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_aa9a4f6159004310a7a20bfa11f9797c.pdf?index=trueIn 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_off0000f9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C2 5348 bytes
SHA-256: 195041f304b760dff69d256d56d05afe8bfd98a997090d9f347e2021e9888c85
font_01_sfnt_off00010c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0E 10952 bytes
SHA-256: 57c87423370620126ec26c85c45e2b207c088b212dd3e2be0e45a9c66a5b16c5