Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ccda8587f20d967…

MALICIOUS

PDF

76.6 KB Created: 2021-04-05 00:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6b41d7837cbba5c7b77eee2414d56b97 SHA-1: b7ce5d4df86347fd1fcd3eac790f6363bd2f1658 SHA-256: 3ccda8587f20d967b0c8af5de2f526a8a60c5a492d32b07af8212230d8eb678f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, indicating it functions as a link farm. One of the primary URLs extracted is 'https://seumenha.ru/strik?utm_term=how+to+earn+brownie+pet+badge', which appears to be part of a phishing or SEO manipulation scheme. No scripts were extracted from this sample, but the PDF structure itself facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/strik?utm_term=how+to+earn+brownie+pet+badge PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388169/normal_603450e718ee5.pdfIn PDF document text
    • https://cdn.sqhk.co/livatunozasu/Kdhdygg/nbc_sports_app_not_working_on_firestick.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381756/normal_5fedac0236963.pdfIn PDF document text
    • https://cdn.sqhk.co/doginifa/ij3Wjhn/febalegiguzodojor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456387/normal_5fe1041c7a347.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/63a4bac7-bbab-46af-bd83-9db270715013/xopofewewijogegirami.pdfIn PDF document text
    • https://30f21d72-2b41-4965-a7bc-2abb02bf1ded.filesusr.com/ugd/47e66e_55457dce698c443fa053cebd94f21d5e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e687da2-a58a-4653-a0f0-0bc20412d671/27591921252.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6a8d84d-4b1a-4ff8-b59c-9ae06dde5c1e/98061462628.pdfIn PDF document text
    • https://8e0cabef-d481-4215-b437-8a5fc4e4723c.filesusr.com/ugd/f41140_2eadcfdd8d124fc49527503f04d9935d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5a22491-7ca3-48d8-938f-4646e9c724d8/new_york_tirsa_rate_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25ed012f-4a6f-44a3-9890-90c3dd2cc745/82354464743.pdfIn PDF document text
    • https://11484d69-1612-41b9-9199-165df1f08223.filesusr.com/ugd/e2f197_d53cf6ad1e334782b614c2dbaf806026.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b47ee95-3e4b-45d2-b224-58cd9763dd89/can_american_capitalism_survive_review.pdfIn PDF document text
    • https://de99934f-f465-4d69-af5e-14f317c0a7c6.filesusr.com/ugd/4fea5c_14dfad6ccc354c8694e30f7474c5eeaa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8739b0c5-a653-458c-8e60-ca24fccaeaec/what_is_the_word_mitosis_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67f3d808-2195-48d0-bf65-2aa6c1642230/lulaxesavijojapinufubig.pdfIn PDF document text
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_c9e2c34dcb4c4bc7bebc602a1c2a62de.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d32d312-2cca-409e-8c8d-36986b217d2d/did_spanish_flu_shut_down_the_economy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/993b42ba-78d2-4e68-bb9f-d7bb2a57d50f/5595721001.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a369251-117c-4793-881f-82387a77b791/76669171121.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AE 5108 bytes
SHA-256: ac7dcbf80ec228b576e6b98dbd7af2e6d6f522e07d2d7e3bb9bfdf8fe4d656e0
font_01_sfnt_off0000f722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF722 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0000ffaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAF 10356 bytes
SHA-256: eaa56f4f6de9cda8bd4eac54ac9c7ed48242f6bffd021f75601c7cb68e768838

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