Malicious PDF — malware analysis report

Static analysis result for SHA-256 a596e0ad16fa9290…

MALICIOUS

PDF

72.7 KB Created: 2021-03-14 10:53:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 989e66e6240a5c437b6d60e5cdab781b SHA-1: 5058aa92f494b1688d4f044b2eb03652370dd4cf SHA-256: a596e0ad16fa929026f88893bef1d5c76de0110d54c95a38f74d904d52960eba
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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://ponafet.ru/123?utm_term=kicker+motor+brackets+swim+platform PDF link annotation
    • http://private-channel.site/zezofaw5cje3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446168/normal_600deca917f65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489724/normal_602ec40b5db8b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426261/normal_6008e04072f59.pdfIn PDF document text
    • https://ropaligezavizaf.weebly.com/uploads/1/3/5/9/135962070/lajaxo.pdfIn PDF document text
    • https://diwifiburu.weebly.com/uploads/1/3/4/8/134871147/juvavupuxedusufewejo.pdfIn PDF document text
    • https://cdn.sqhk.co/tarekekog/ieIie57/taxoviko.pdfIn PDF document text
    • https://cdn.sqhk.co/salobosemiv/hj247w5/wuzosaguvozomaz.pdfIn PDF document text
    • https://puxonuge.weebly.com/uploads/1/3/1/3/131383548/kirojuj-namaj-vewinib-walese.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366014/normal_60309cbb4f50b.pdfIn PDF document text
    • https://cdn.sqhk.co/xomakonezema/j4ibKgi/toletilokiduxaji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467581/normal_604c96c515e51.pdfIn PDF document text
    • https://cdn.sqhk.co/nakusunegud/hcibslI/habitos_alimentarios_oms.pdfIn PDF document text
    • http://giocodigital.fun/sat_december_2018_test_answers92ur8.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/75ff3386-b021-4f08-a059-d50cdec942fc/gevexapawobenovu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5116fa5-f8e8-422d-930f-0039f3ff9562/38283181272.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/408c9bd3-fc6e-46f1-afc4-1b51ec896d6c/suwixukafavumububu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce5ea5ac-5ed6-47b9-93b9-981b2e52da6c/what_size_tires_does_a_2013_dodge_avenger_have.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66ade8d4-326f-484e-8cf5-84b60fd5e20f/41705930931.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_off0000ddd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD2 5424 bytes
SHA-256: 8984d1f5ac0a61e7944ad22495c184fdea9ecf68d231cc973e210080e4ddfd05
font_01_sfnt_off0000f044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF044 10948 bytes
SHA-256: 5e7d6f85c07d4719d724dfe507d92e1beafb2fcf7c6879b313ec54d26b366169

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