Malicious PDF — malware analysis report

Static analysis result for SHA-256 d79ef4a64ea528e6…

MALICIOUS

PDF

72.6 KB Created: 2021-03-07 10:54:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 6b9c671da6f4f00f0e89c0455a949d95 SHA-1: 701375f17737f5dfcb482dcf42574aae0016e43a SHA-256: d79ef4a64ea528e636d19f6f3f0d44aca9cb701a1a6d1929a116213b7cc5c5c0
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs and the document's structure point towards a tactic of using seemingly legitimate search result lures to drive traffic to attacker-controlled infrastructure.

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://midufefew.ru/123?utm_term=molecular+cloning+a+laboratory+manual+4th+edition+pdf+free PDF link annotation
    • http://jekeluxuto.mywebcommunity.org/computer_chair_high_weight_capacity.pdfIn PDF document text
    • http://instasurprise.online/8567452791976jcp.pdfIn PDF document text
    • http://garantiya62.ru/62856096313cs6m4.pdfIn PDF document text
    • http://vekisonoloze.sportsontheweb.net/is_kindergarten_required_in_georgia.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/xotulevudeb.pdfIn PDF document text
    • http://d-youtube.com/15959224882egwne.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gevapugono.atwebpages.com/stanley_45_hand_plane_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db0b7d88-487c-4628-b69f-a70705d8674e/25964601268.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e1aaa6f-6f57-4778-b09c-f6e3ca778e32/komalinu.pdfIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_b589ecf1addf4dc093b93310d983ecf8.pdf?index=trueIn PDF document text
    • http://bafuwujix.atwebpages.com/dosoxolusijixapoke.pdfIn PDF document text
    • http://movasedumanepe.onlinewebshop.net/imax_b6_charger_cable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b6444d6-e2ce-4ec2-84a3-f7bb7b681397/80127930490.pdfIn PDF document text
    • http://soranodabiwegi.myartsonline.com/how_to_build_market_intelligence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/987e73a3-1e32-49be-b959-9e98b6ddd794/76236065109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ff9844f-565c-4d54-9602-6a1b332d2c68/practice_the_presence_of_god_by_brother_lawrence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2a8f937-a328-408b-8b35-fc6095761739/brother_ls_2125_price_nz.pdfIn PDF document text
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_616785431be541beb0177e11869a5b15.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b999d1fe-a7ee-452a-9bbf-e8afe14ea10a/xabobakoruluvobekana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d024603c-3c5f-4f0c-b67d-94c47644a56d/maytag_quiet_series_200_not_draining.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_off0000dceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEB 5724 bytes
SHA-256: f0f75099d3178b07b57483e2065b099a5db7de07a51c1ebf2a272e82eda4bc9e
font_01_sfnt_off0000f05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05A 10636 bytes
SHA-256: 5f2b6a8e096357b58a462a541fa1af9d577600836d3fe8f2ba45f1719d2cb7e6