Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a6eb82b973393b…

MALICIOUS

PDF

77.1 KB Created: 2021-04-04 20:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 00376adbb0413b310b33aaec87c0b792 SHA-1: c7b197657a9459af114b96cd8ba6037c2857e272 SHA-256: 77a6eb82b973393b12dd73806aa6a0a042306d2fae609736df4914e6094a6963
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jumiwimov.ru/award?keyword=manual+epidemiologia+y+salud+publica+pdf PDF link annotation
    • https://taregegojife.weebly.com/uploads/1/3/3/9/133997559/234e967dd22cee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485005/normal_5feb84e501c0f.pdfIn PDF document text
    • https://naxovemunozi.weebly.com/uploads/1/3/5/9/135958864/5f6a82153.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388629/normal_5fd7922097128.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417818/normal_5fe610d68ab22.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481839/normal_5fc91ef323d68.pdfIn PDF document text
    • http://wureteputup.iblogger.org/royal_mail_postage_costs_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450424/normal_5ffabf1b4010b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375515/normal_60609bdcbf81a.pdfIn PDF document text
    • https://zawibovime.weebly.com/uploads/1/3/2/6/132681883/wanorogusuxeb-dukobovitizev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bulasejazaw.epizy.com/tawanudivimiluja.pdfIn PDF document text
    • http://gugamofizuxeg.epizy.com/dagigupijuruselo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c7d7b88-0ed3-4d7f-9b5b-7217253e1769/concord_furnace_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9791b57c-d365-45a6-a34d-6afa8bad53a3/20939381932.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f031a6e-40fa-4da7-b662-197a81c10778/68499761004.pdfIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_6741d6d1a9b3413691935b61a942866a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e9c5683-8ef0-415b-b26e-fba9a404f091/14648807136.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/401e2829-bc7b-4b92-aece-61e9ed9a7223/what_is_the_lowest_age_of_consent_in_the_united_states.pdfIn PDF document text
    • https://d1b33a7b-cde1-45d4-bc15-d4d3b6236ac5.filesusr.com/ugd/1d64af_f4d5e61049f842cca2951266c67bdcfb.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA82 5624 bytes
SHA-256: 1a6d556b5d662f3b2a0116a62af3e3cdb07ed0c27759ad0b29f21659517ecc7b
font_01_sfnt_off0000fdb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB1 12452 bytes
SHA-256: 463f29c153aa604c2ebd3e3f6e8eec05cc82d732b07758a995a7697e1598d775

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