Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0795b8d7ecce90a…

MALICIOUS

PDF

82.6 KB Created: 2021-04-08 10:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9be089beabc71676352cadca5ce4c48f SHA-1: e8640e88704a7b3af128e8ff758b5dc951251700 SHA-256: c0795b8d7ecce90a2ba6a3391d1649fe5af67e2ee2b8af65c2e7f6c01cea3b6c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains and utilizing UTM parameters, indicative of a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically classified as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://mezovuduw.ru/strik?utm_term=porter+cable+scroll+saw+pcb375ss+parts PDF link annotation
    • http://sowizibusi.22web.org/doubledown_casino_facebook_free_chips_codes.pdfIn PDF document text
    • http://sunepoxuvigos.66ghz.com/dedas.pdfIn PDF document text
    • http://subumobo.22web.org/green_gram_health_benefits.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/8a5bdb1b-19e2-4719-bddd-b13353b4bef0/how_to_change_battery_ti_ba_ii_plus_professional.pdfIn PDF document text
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_ded5de040c754760939d85f57488405c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2f077fe-65ac-4196-8e94-b6fddeb3ddb6/best_mackie_analog_mixer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a7a6420-320c-40f4-8a23-620139a70ca7/headache_when_sexually_excited.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b17e1abd-435e-40b1-9fa5-218bb50e4906/most_hurting_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f24209b8-09bd-4503-8057-e89766917c92/the_art_of_living_foundation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14bcd45c-ac47-46e2-9d9f-e95ee25e4843/nofuxuvesoselunigiradowos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b46ab2d-9773-4847-b87a-0d2e06d64d2b/depowufegosa.pdfIn PDF document text
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_e1fb1b363ae942b691760cefe1c27be9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/13531db9-82df-4550-a927-5ca0d53ba9a4/10642534257.pdfIn PDF document text
    • https://91506351-5699-48ce-85e7-8e7d071f4e87.filesusr.com/ugd/d775a9_63455d0a924e4edbb750c1875ff731b6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fccc0fc-0ecc-4e37-a139-ab2d66373675/dirumapixawukarivomuledab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0317a24-5c35-4db8-8054-5647466a5ae5/vajupitatusisedek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d477c3b-90c7-481e-93a5-54eb04c864e0/my_husbands_secret_wife_wiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/122e48b1-a59b-44cf-ab20-ee5f511fdc21/tedurubawadojowu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11fc0494-33f2-4e0f-a9dd-865936a79196/61106872877.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3834dc81-2118-4c5c-827b-73a9867114ac/98091756155.pdfIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_bf920b5d4bae4639a82c5db56ece976f.pdf?index=trueIn PDF document text
    • http://gajiresidar.epizy.com/4811774895.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ea0efac-52f1-467f-ba7b-297ad013688b/jemun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bccef79-1294-4c1c-96d3-015297aab93c/99133424649.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_off000100b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B6 5528 bytes
SHA-256: da3c93421229d0a73cf0bde9434a17ad8d2a739d65be02ca4b3b81194c278255
font_01_sfnt_off000113a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A9 11504 bytes
SHA-256: ddf20243578c0ad0353b6ef0cda2b878801146a8aec320b93b30ed409e94b536

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