Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0fe610d31f4fd2b…

MALICIOUS

PDF

66.3 KB Created: 2021-04-11 23:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6aa6aa1e52893edd579860f797f10d64 SHA-1: db09bf2e217b449cbaf2973f664db9ab2a8bd082 SHA-256: a0fe610d31f4fd2b495900883fb6c7c232aae581ad359c1e114d6363b4315b44
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 0.9998

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://nipisod.ru/strik?utm_term=sweep+picking+exercises+songsterr PDF link annotation
    • http://bukudix.getenjoyment.net/abituriyent_jurnali_2020_kecid_ballari_yukle.pdfIn PDF document text
    • http://zavarivaemvmeste.ru/80614348557y4ry.pdfIn PDF document text
    • https://vuxisiso.weebly.com/uploads/1/3/5/3/135321279/fepugesa.pdfIn PDF document text
    • https://badikixokatapi.weebly.com/uploads/1/3/0/7/130739740/1916688.pdfIn PDF document text
    • https://boripate.weebly.com/uploads/1/3/4/5/134590871/rorawiten.pdfIn PDF document text
    • http://mon-cmbretagne.com/avenged_sevenfold_afterlife_piano_sheet_musiccxe34.pdfIn PDF document text
    • http://fejukoturig.medianewsonline.com/gimorawive.pdfIn PDF document text
    • https://motisodufar.weebly.com/uploads/1/3/5/4/135400919/vibib.pdfIn PDF document text
    • https://bovefunovowuto.weebly.com/uploads/1/3/0/8/130873908/buguginapidedo_xedig_fefopora.pdfIn PDF document text
    • http://baffer-shop.space/how_to_write_a_cover_letter_internal_positiony1vy8.pdfIn PDF document text
    • http://jukojadijomefar.medianewsonline.com/83956144425.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_f6e690324fc641efaa7aa7f054848d87.pdf?index=trueIn PDF document text
    • http://jamenajiko.myartsonline.com/cbse_class_12_sample_paper_2020.pdfIn PDF document text
    • https://2a0daf8d-7d8f-48a8-9da6-1f2c606fcb3a.filesusr.com/ugd/adb9e1_3fb6fd0c697d47028915d75cfe73214d.pdf?index=trueIn PDF document text
    • https://025b4bf0-2906-4f5f-8a0f-6d4b68fc9518.filesusr.com/ugd/148ee2_a3256e3fba5a42b69c8a3a1135404af6.pdf?index=trueIn PDF document text
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_0e78755cdfb6421fa2e80016915393ad.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FF 5188 bytes
SHA-256: 540ce63dbc701f4f1b5e236ac8e93d9ced0c034ba21f062335bd6cae4a6d1048
font_01_sfnt_off0000d8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D9 9972 bytes
SHA-256: 08cefa4dbb6e9b80e5e671136f3d723f1c06688264fbee11e468080aa3afa7fa

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