Malicious PDF — malware analysis report

Static analysis result for SHA-256 d93bcb5b747b3177…

MALICIOUS

PDF

70.2 KB Created: 2021-03-22 07:13:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: e82c5e7580045f37a1138ee11b14e767 SHA-1: 65bb3b39fa93106a8ae2044b756d39db0c01b56a SHA-256: d93bcb5b747b3177c3e9125997cf5b407833c4d7f6a52b1f82bbd1fcb42d9d30
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The primary lure appears to be offering a free, older version of Adobe Reader, likely to trick users into downloading a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://dugedepap.ru/123?utm_term=adobe+reader+old+version+free PDF link annotation
    • http://gabutetidik.22web.org/guided_reading_books_ks1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sedisukaviz.rf.gd/fozaduriwedumobuf.pdfIn PDF document text
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_aa395d898dc348348882cd0b2f5f050b.pdf?index=trueIn PDF document text
    • http://jokunikef.epizy.com/xonokenafobawelivera.pdfIn PDF document text
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_cb3a00228bd349e0a59685eb722d2a16.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/simujix/governed_retirement_income_portfolio_4_data_sheet.pdfIn PDF document text
    • https://ef4b221f-cfb4-47e8-bf1d-3b5092770df7.filesusr.com/ugd/4948da_fca0b895ae4e4ee496027d805a199087.pdf?index=trueIn PDF document text
    • http://roxegut.rf.gd/how_to_prove_photosynthesis.pdfIn PDF document text
    • https://ede36962-9452-4451-b182-fa4236ba9bc6.filesusr.com/ugd/83b1b3_2d21e4673d45487b8e83aeebdc28c930.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/971f13ac-6d8d-4c2b-ad2f-ea2931dc4a25/27255966332.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/nutone_central_vacuum_bags_vx3918.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/noluwodokumuxezub.pdfIn PDF document text
    • http://mafefelanepule.epizy.com/marshmallow_recipe_using_sheet_gelatin.pdfIn PDF document text
    • http://tesuzegijibonu.epizy.com/minetta_tavern_michelin_guide.pdfIn PDF document text
    • http://tidegofavinugaw.epizy.com/41822729221.pdfIn PDF document text
    • http://kitojob.epizy.com/lovegenuk.pdfIn PDF document text
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_9c03064996514f1793586db9fe36419c.pdf?index=trueIn PDF document text
    • http://tuwojusedikemi.rf.gd/65522865384.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a072df9-ad95-4e0a-985b-4cd05ba50bc6/can_i_claim_maternity_allowance_and_work.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_off0000d5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BD 5092 bytes
SHA-256: 2e791a869d56066402d92efc231575a6c6b7ab808bf2307148fccc6200812389
font_01_sfnt_off0000e723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE723 11036 bytes
SHA-256: 2f24a528d02c7fcea15a499e46462d1eb6779a1e698e8a3b4ec2444ff0a4674b

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