Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0b07e02b47c4a1c…

MALICIOUS

PDF

67.8 KB Created: 2021-04-28 16:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 52f940fa2ab7e32b2955a7f763ba6152 SHA-1: 9924057f72e59ca8a932cadc9243ed1ea624c8cd SHA-256: f0b07e02b47c4a1c25e4bc8be21c944382990b622721529fe9f3861dca79b0cc
186 Risk Score

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 0.9997

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://crophysi.ru/strik?utm_term=organic+chemistry+solutions+manual+pdf+klein PDF link annotation
    • https://cdn.sqhk.co/woviwefi/Rgdhdtc/zolepovut.pdfIn PDF document text
    • http://mudopuxez.22web.org/alif_lam_mim_download.pdfIn PDF document text
    • https://cdn.sqhk.co/dawiredi/he9O6X6/49815505228.pdfIn PDF document text
    • https://cdn.sqhk.co/kejofuvata/dgdgdTq/54384159107.pdfIn PDF document text
    • https://cdn.sqhk.co/salasereki/fhfssjg/my_block_my_hood_my_city.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://noluduji.epizy.com/nogedomediropiji.pdfIn PDF document text
    • http://minuwugonobusuw.epizy.com/turbo_cartoon_full_movie_in_tamil.pdfIn PDF document text
    • https://50c84cdf-c8d4-407e-a307-361b94491100.filesusr.com/ugd/f2656e_3d14cd9754cd4be989fc60916724e6ad.pdf?index=trueIn PDF document text
    • http://pudopidurisego.epizy.com/26901913752.pdfIn PDF document text
    • http://somujewod.rf.gd/46927497657.pdfIn PDF document text
    • https://1e438cd7-6f3b-42ac-a97b-d13a75fa135b.filesusr.com/ugd/0c268c_e6644cc427294521b0d9146a0b80abd3.pdf?index=trueIn PDF document text
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_192f336a773943dba331aa0a07f7ead3.pdf?index=trueIn PDF document text
    • https://a49a6154-edc8-4132-95a2-c7bb8d673fe9.filesusr.com/ugd/551169_5cb1a8ee2aa84729985bba92c3132e14.pdf?index=trueIn PDF document text
    • http://malanawojuko.epizy.com/36447135790.pdfIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_89a0160565f44fbb84910d0a7ae2272c.pdf?index=trueIn PDF document text
    • http://gapevizatijaba.epizy.com/mosigofazekeg.pdfIn PDF document text
    • http://kirawolus.rf.gd/96193380405.pdfIn PDF document text
    • http://kotowadanoli.epizy.com/employee_id_card_template_psd.pdfIn PDF document text
    • https://cf62593c-3f62-494e-9ef9-3c2a63ead7d7.filesusr.com/ugd/93dae2_e5347f81c670416e8fa9ce4efd086ec7.pdf?index=trueIn PDF document text
    • http://migolow.epizy.com/2423671204.pdfIn PDF document text
    • https://63995da9-74be-4895-8497-a4fa53c9845d.filesusr.com/ugd/788c84_ca464579f9284ab69264fed3297fa9cf.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BA 5760 bytes
SHA-256: 38fc5fc94d4ba0e55545fb3b7e91c330f7a24ebba501ab9073352f5476f1c3d8
font_01_sfnt_off0000dd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD36 10692 bytes
SHA-256: cd58254b0c5629f6ea782635b96854de127d111af01c8ab2330bb51495c4a17b

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