Malicious PDF — malware analysis report

Static analysis result for SHA-256 a69b5a361ba40a43…

MALICIOUS

PDF

76.4 KB Created: 2021-04-07 10:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f3d2ce80329d4a66aff44a4a524a1e7d SHA-1: b39838ca06e56d74a6e59b7dcad10b46f92ced9b SHA-256: a69b5a361ba40a4319c8b64aeba5fb8cebd710278af0fda2f936271617057b20
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm designed to distribute traffic to potentially malicious sites. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly supports maliciousness. The embedded URLs suggest a phishing or malware distribution vector, likely initiated via spearphishing.

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://jumiwimov.ru/wix?keyword=diskdigger+pro+viralhax+apk+free+download PDF link annotation
    • http://xalasezogifigi.22web.org/50667627351.pdfIn PDF document text
    • http://ravovenovibu.medianewsonline.com/27949257158.pdfIn PDF document text
    • http://nagaxutunasom.22web.org/flhsmv_traffic_crash_report.pdfIn PDF document text
    • https://lumujuserav.weebly.com/uploads/1/3/4/7/134709999/9245164.pdfIn PDF document text
    • https://kulabukotijol.weebly.com/uploads/1/3/4/7/134703535/9749592.pdfIn PDF document text
    • https://roxowuvunesoneb.weebly.com/uploads/1/3/4/8/134889799/8826651.pdfIn PDF document text
    • https://vuxutuwatojo.weebly.com/uploads/1/3/4/6/134625262/jojobujofitosubi.pdfIn PDF document text
    • http://gajonedorebuko.mywebcommunity.org/69736184349.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/3334c3bb-a516-484a-93e3-c730eb65ba82/402136914.pdfIn PDF document text
    • http://ziwemasux.myartsonline.com/wellness_wheel_activity_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edd53871-9a53-4641-b45e-0ac41300f64a/acurite_meat_thermometer_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d4494cc-ea22-4b5e-8457-76b0cc094dc0/libapazopewox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1ccd9ca-e72d-4cb3-8fe8-ce22735d0b15/how_to_change_needle_on_ion_turntable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/536b608d-82e0-4dd0-bb8f-d43bb8afc13d/mini_dachshund_puppies_price.pdfIn PDF document text
    • https://ddd90330-5837-4e0c-b2f6-9383941cd2db.filesusr.com/ugd/568e2c_819cffe02db64ad592f274b9bdae8cc4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc996af2-f74e-481c-8076-c47c33321aaa/how_to_get_rid_of.blind_pimples.pdfIn PDF document text
    • https://7be8961d-effb-4c78-a255-78c3c9f0be09.filesusr.com/ugd/3dd68e_81877f6708e24d1cbd13cb3c0aa152fe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d5c9526-2d60-4529-b3d8-751728d79f4f/cant_stop_the_feeling_just_dance_lyrics.pdfIn PDF document text
    • http://somasetowijo.myartsonline.com/86446973973.pdfIn PDF document text
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_3d7cdb81c18441238eb97b11c3d1f9ce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/167ce8b7-53c7-47bd-a3c9-16926aa89241/50481688903.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_off0000eafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFD 5584 bytes
SHA-256: d8b4176cbe5be2b3e368b67719c5c8396510f1df5cdcc26742d213307fc8363f
font_01_sfnt_off0000fe26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE26 11204 bytes
SHA-256: 89b0dbed9b74642b35690047c7aa158d59cfa16b7d4b7985d4474259d9e7e1c7