Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd2d4e2b7babd3c6…

MALICIOUS

PDF

80.7 KB Created: 2021-03-09 03:30:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 3158a4db70b6b01dca93c303309223a1 SHA-1: 28541b0ce45fd9a1f467db9c233c64e52ac5b333 SHA-256: fd2d4e2b7babd3c6bf835a81cb811eab4f12b5aceae19a949c857f18b509f96f
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 or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://resalured.ru/strik?utm_term=what+is+the+new+keeper+of+the+lost+cities+book PDF link annotation
    • https://cdn.sqhk.co/sewetotab/85g3shh/gimogimuloxakifataru.pdfIn PDF document text
    • http://instasurprise.online/lebitoiqzun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405179/normal_600353eea3c2e.pdfIn PDF document text
    • https://cdn.sqhk.co/pedidagow/bL2TNhf/galactic_attack_2020.pdfIn PDF document text
    • http://goldstein.capital/89314060253r42tx.pdfIn PDF document text
    • https://cdn.sqhk.co/xogovofofi/MOjaQyw/71750885034.pdfIn PDF document text
    • http://rafale.store/fisher_price_roarin_rainforest_jumperoo_weight_limitk6hpq.pdfIn PDF document text
    • http://magic-world.site/99133756470o0zfx.pdfIn PDF document text
    • https://cdn.sqhk.co/kefiruge/ieIREje/digital_marketing_certificate_courses.pdfIn PDF document text
    • http://fitokaps.xyz/secrets_of_the_wonderlic_test_study_guidewcxc6.pdfIn PDF document text
    • http://familyit.pro/lodagavumadinadifewilevokjmn2.pdfIn PDF document text
    • https://cdn.sqhk.co/mezigiduze/0W2jjLt/best_buy_near_me_paterson_nj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393485/normal_60460f1a343c2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://1423d76f-a56f-4481-bf87-726e17039346.filesusr.com/ugd/14aee2_41301e287cce4a2aa2e822feb00766ac.pdf?index=trueIn PDF document text
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_9b5bdbbe989941a395bd6327279ee286.pdf?index=trueIn PDF document text
    • https://3175e58c-9db9-4d87-bcb9-15e03531d93d.filesusr.com/ugd/c93210_9eb36dd94b904201a4a2e3d686535f8d.pdf?index=trueIn PDF document text
    • https://f9fc249e-2e6a-4908-9eb0-88005465a50d.filesusr.com/ugd/2530ee_93f8ef204a0049499b2523eb16954636.pdf?index=trueIn PDF document text
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_5429318162914639b847251641db3f93.pdf?index=trueIn PDF document text
    • https://1482387f-61d8-47e1-b538-9b7f1e8b89fb.filesusr.com/ugd/538d67_83d774ff34c14334b79c31f96ee1e753.pdf?index=trueIn PDF document text
    • https://e8e87dc5-637d-47ba-9de6-e7d98d123d78.filesusr.com/ugd/a69a03_0b0a2cd475be47d0a92d2a00c1073d6c.pdf?index=trueIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_ce409685984c497f8c92c66e82f38b04.pdf?index=trueIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_b3488b87948e4125b55600e5e832f62c.pdf?index=trueIn PDF document text
    • https://73a1781f-5c9f-4c76-8a11-a8e8c44f336a.filesusr.com/ugd/d9f7b5_526e35902b4040be9a85d2fdc9d7eb56.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF191 5200 bytes
SHA-256: 7afecb6665ef856740cb55e154b1cd2efff6d889fd435f31011d12be6ea86bcb
font_01_sfnt_off00010340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10340 10436 bytes
SHA-256: d1d2eb984696c81561bdd7d63b2fb96033033f6507232dd5f5778a4e34030a89
font_02_sfnt_off00012724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12724 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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