Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa6959a8fa7e0a1…

MALICIOUS

PDF

81.1 KB Created: 2021-06-09 07:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f5c8d0d54341f43e667998fcc7183d69 SHA-1: cccfac5646877ca59bace84c0bc578732661e0b2 SHA-256: cfa6959a8fa7e0a15e34b9918d52da9386ef1edf1b387a5fd2f96f104f128c3c
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a large number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. The primary purpose appears to be SEO manipulation or directing users to potentially harmful content, rather than delivering a direct exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://catamma.ru/pbw?utm_term=atoms+and+their+isotopes+worksheet+answers PDF link annotation
    • https://repitosa.weebly.com/uploads/1/3/2/6/132681506/a4c4aa62c1.pdfIn PDF document text
    • https://bofaragimemax.weebly.com/uploads/1/3/4/0/134096626/senotigu.pdfIn PDF document text
    • https://venonaneguwar.weebly.com/uploads/1/3/5/3/135398509/vazelaveke_bogexud_nitesetito.pdfIn PDF document text
    • https://konizalo.weebly.com/uploads/1/3/5/3/135388679/5273228.pdfIn PDF document text
    • https://torurukiruxo.weebly.com/uploads/1/3/4/5/134529807/gulejepax.pdfIn PDF document text
    • https://bijixaxiferagew.weebly.com/uploads/1/3/0/7/130740480/8581797.pdfIn PDF document text
    • https://wezisewego.weebly.com/uploads/1/3/5/3/135342704/5350683.pdfIn PDF document text
    • https://wisukemebo.weebly.com/uploads/1/3/5/9/135962546/xepem-runov-kifiz-xafararugu.pdfIn PDF document text
    • https://zodoxofavuzawa.weebly.com/uploads/1/3/1/4/131437464/bupibugekin_bazonuwije_bejutugumeg_xurisigisizes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuzujufod.pbworks.com/f/megobatuzixefakijewi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d090be1b-80c8-4909-bcfd-bee063b23284/96369216919.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a13e1ab0-4c33-4a9c-8227-da82d7ab9748/59214639741.pdfIn PDF document text
    • http://fokopaviwu.pbworks.com/f/how_to_insert_a_dixie_cup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5b5c587-3c55-4a3f-87e4-fe758aa9c122/what_is_a_radical_republican_definition.pdfIn PDF document text
    • http://wuvebag.pbworks.com/f/samsung_galaxy_tab_10.1_ce0168_specs.pdfIn PDF document text
    • http://sawanixum.pbworks.com/f/dls_2021_unlimited_coins_profile.dat.pdfIn PDF document text
    • http://nozobitativi.pbworks.com/f/soserurexawazilusapegag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06fa93db-1da7-4c28-af4d-510724378b25/dovegonuwixufuw.pdfIn PDF document text
    • http://kunozulig.pbworks.com/w/file/fetch/144554673/how_to_win_a_coin_machine.pdfIn PDF document text
    • http://mazibudikor.pbworks.com/w/file/fetch/144674715/how_to_clean_cuisinart_supreme_grind.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ec3a886-ecae-4978-9feb-322255ab13c2/how_to_help_my_back_pain_during_pregnancy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55e6afc7-f1ba-4c1e-8261-b91c01529865/bagefobeboj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b1a3703-bb66-4379-a98e-c3bb209167a1/71255689965.pdfIn PDF document text
    • http://togusan.pbworks.com/f/xisigewup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bb0259c-7c44-4226-9f09-550c1468d378/divubupuxikuwofikud.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_off0000fc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC31 5312 bytes
SHA-256: 6312fc7afb34671cebb6e68e832ef74aacf8188c9d31cda4502a5734e7f54f86
font_01_sfnt_off00010e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E21 11344 bytes
SHA-256: 5150fc6a3a65eb65a6ed1667da1802d051ad2583a1acb5137ec7bb52921991e7

Open this report in the interactive analyzer, or submit your own file for analysis.