Malicious PDF — malware analysis report

Static analysis result for SHA-256 887051bc90c8b676…

MALICIOUS

PDF

60.2 KB Created: 2020-11-25 20:49:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 8375f399ada3e90f5ecfdc71cd63703c SHA-1: ba88d282e38aca2a230710d11b037e0fedb8ef9e SHA-256: 887051bc90c8b6767fc424d8ac3d634fb6dd5d2a15921673294224a456042caa
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 0.9994

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://traffnew.ru/strik?utm_term=tribal+belly+dancer+costume PDF link annotation
    • https://gogebuzavoriro.weebly.com/uploads/1/3/2/6/132681212/5507230.pdfIn PDF document text
    • https://fulodovujigiw.weebly.com/uploads/1/3/4/0/134016909/5548367.pdfIn PDF document text
    • https://mefapepuj.weebly.com/uploads/1/3/4/3/134310437/balezapudejew.pdfIn PDF document text
    • https://xexovelez.weebly.com/uploads/1/3/0/8/130813416/gubozisifin.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/pebofezujizu_wuzafe_tevodujiwaxu_mujemiw.pdfIn PDF document text
    • https://dufubixapitosig.weebly.com/uploads/1/3/4/5/134503348/mivefido.pdfIn PDF document text
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/zoraxegis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e2afc8bf-1b82-4d8c-8a73-832fee769936/lamirobuwug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66644e38-2398-4697-af98-d13eba02187e/47911765269.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4bb469d-d078-4b55-8dd0-32ee0abab8db/wuzagarodu.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/school_of_chaos_hacked.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_off0000a61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA61E 5160 bytes
SHA-256: 7702ebd51b0c5316a8dcab06b0a0a0ce70b7fb6fa8fab7b6870fb86be62f475a
font_01_sfnt_off0000b782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB782 8968 bytes
SHA-256: dd14d6fd05a8d7006f1162a418b08140dd5fca24d112c55ed59dfc3794c847c4
font_02_sfnt_off0000d637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD637 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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