Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa3b1846410c1b3b…

MALICIOUS

PDF

64.0 KB Created: 2021-04-03 08:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa38335a0255e3acd9696db12719e8c4 SHA-1: b68781458a21d7f6b12361c5bc83cb5d3ae26b20 SHA-256: aa3b1846410c1b3b15d5de82495f90bbcf999df30758b1898526884845adb3fc
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of external links, many hosted on disposable domains, indicating it functions as a link farm. The ClamAV detection and ML classifier flagging suggest malicious intent, likely to distribute malware or engage in phishing. The embedded URLs and the nature of the link farm suggest an attempt to manipulate search engine results or lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7741

Heuristics 5

  • 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.
  • 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
  • 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://maypoin.ru/award?keyword=actuarial+science+course+outline+pdf
    • https://pegufozexak.weebly.com/uploads/1/3/5/3/135317465/d47369.pdf
    • https://cdn.sqhk.co/bumajanivosi/iiigigf/octagon_space_4d_cards.pdf
    • https://zojozonamu.weebly.com/uploads/1/3/1/4/131438692/gobawinoxazix-zugix.pdf
    • https://nujalujuxak.weebly.com/uploads/1/3/5/3/135347358/2d71d420dcda.pdf
    • https://cdn-cms.f-static.net/uploads/4426944/normal_6022d1c3bd511.pdf
    • https://lekomuge.weebly.com/uploads/1/3/4/7/134773229/0aaa198.pdf
    • https://wonumizesux.weebly.com/uploads/1/3/4/6/134631676/ranopinimobu-rugot.pdf
    • https://vumuzuvi.weebly.com/uploads/1/3/4/5/134506571/soxizarazimowiw-magitipadokupa-najewesa-nonijuk.pdf
    • https://tarezusubem.weebly.com/uploads/1/3/5/3/135386237/293861.pdf
    • http://tapozifokun.mywebcommunity.org/45344198703.pdf
    • https://cdn-cms.f-static.net/uploads/4376849/normal_605e0e6dd5ee0.pdf
    • https://cdn.sqhk.co/rapovixovuti/V21Hjab/good_fortnite_bedwars_maps.pdf
    • https://cdn-cms.f-static.net/uploads/4366365/normal_6015845d31eca.pdf
    • https://cdn.sqhk.co/wufevinek/hdyTzhf/pocket_mine_2_apk_mod.pdf
    • https://static.s123-cdn-static.com/uploads/4445735/normal_5ff688682d222.pdf
    • https://cdn.sqhk.co/pagozixupezi/8RJjh27/61081016002.pdf
    • https://lidutefavova.weebly.com/uploads/1/3/4/0/134012516/634723.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gupatevefojip.myartsonline.com/zavexeranujofij.pdf
    • https://uploads.strikinglycdn.com/files/b160d91b-0906-4bcf-995e-b207d0f6e733/forgotten_realms_history_5th_edition.pdf
    • http://zakefuki.myartsonline.com/a_view_from_the_bridge_full.pdf
    • https://uploads.strikinglycdn.com/files/889ebef1-22f6-4613-8c41-0f5d2801761b/the_reluctant_fundamentalist_full_movie_online_free.pdf
    • https://uploads.strikinglycdn.com/files/440b1520-6088-48e2-a392-d658e5418458/nuxebiwis.pdf
    • https://uploads.strikinglycdn.com/files/0b2aea6f-18f6-4fea-84b0-0c8d4a451653/pitch_anything_chapter_summary.pdf
    • http://kisalonokexiwi.atwebpages.com/60223456769.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f303.bin
980e6910f336a8f198458d60d8543f1e5d76a2efbcce3def1232c432fe22911c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF303 5140 bytes

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