Malicious PDF — malware analysis report

Static analysis result for SHA-256 a610458e6e5b57d2…

MALICIOUS

PDF

71.2 KB Created: 2021-06-08 10:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7a4a601b07222d433a3ac6e3cb4b8e6d SHA-1: 5e4f8f84380536d3849440ba790ed20f812f146d SHA-256: a610458e6e5b57d2b3cdee1617f4e685455242950520e4503f07eaa00da7c4cb
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://allytemp.ru/pbw?utm_term=cuantos+metros+cuadrados+tiene+una+hectarea+de+tierra+en+colombia PDF link annotation
    • https://nimukebobe.weebly.com/uploads/1/3/4/5/134527887/rawewipoxemituvu.pdfIn PDF document text
    • https://kiwazavu.weebly.com/uploads/1/3/0/7/130776346/d16cf112e5f887e.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/fdec068b-9a46-4f54-90ff-fc7be15f67a6/how_to_reset_a_alpine_stereo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34926172-73a1-4399-a111-c307965bcb69/zonudozewavezisizuzumuxi.pdfIn PDF document text
    • http://jujirafamena.pbworks.com/w/file/fetch/144465450/fadagirem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab0386aa-0596-4377-8562-fb67a10166b8/81314542887.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47efe689-ed7d-4a7c-b3d2-d61abd02e229/why_is_rise_of_the_ogre_so_expensive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87a2aec5-405f-4ea9-9e1e-e8e22e1d69b0/zexobi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceef9f51-fd39-4619-ab9a-b81ce1e33b3f/how_to_set_woods_outdoor_timer.pdfIn PDF document text
    • http://junerew.pbworks.com/f/wemineluvafujuvesa.pdfIn PDF document text
    • http://mumasenekera.pbworks.com/w/file/fetch/144417771/football_manager_2014_patch_14.3.0.pdfIn PDF document text
    • http://luwapoveduvi.pbworks.com/f/mario_kart_tour_characters_with_extended_tongue.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db5f64d6-1b26-4647-b0df-05541c2d7776/regifiwuxifutibiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83183ebc-3309-41f4-b6fa-bf6d1abce520/is_furnace_covered_by_home_warranty.pdfIn PDF document text
    • http://mabigeroxoso.pbworks.com/f/61087753649.pdfIn PDF document text
    • http://zuguwar.pbworks.com/w/file/fetch/144709353/xarujivitajadetoraz.pdfIn PDF document text
    • http://fixiguru.pbworks.com/w/file/fetch/144572253/wiwiwi.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_off0000d758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD758 5224 bytes
SHA-256: 0ab7a8dba8645eddd688b45bd50cb55fb1413081a790b6c0395ffccf915f1528
font_01_sfnt_off0000e8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E0 11844 bytes
SHA-256: 5720618eebeab8c96af06c301f0622f890d2ab64c525a01986a8d6dfccdae07c

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