Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8f341da63267a0…

MALICIOUS

PDF

73.9 KB Created: 2021-02-26 15:04:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7641458fd45c0b3d75c3c5393e52853c SHA-1: de0bb7d3c8e4befec27a4283cd5ecd35e213faf6 SHA-256: aa8f341da63267a01b7ddb28328b237c8fecee808deaa6b0d70045fdc9baed26
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF_SEO_LINK_FARM heuristic specifically identifying the suspicious linking behavior. While no scripts were explicitly extracted, the nature of the PDF and its embedded links suggest it is designed to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/wix?keyword=grizzly+man+critique PDF link annotation
    • https://sigesibum.weebly.com/uploads/1/3/1/4/131438142/7548863.pdfIn PDF document text
    • https://lurugidapu.weebly.com/uploads/1/3/4/3/134315770/jinanekoman_wezekede_zupiditaledul_jurepi.pdfIn PDF document text
    • https://cdn.sqhk.co/senuziker/Khbigha/76706811746.pdfIn PDF document text
    • https://medivurufif.weebly.com/uploads/1/3/1/4/131407406/2846444.pdfIn PDF document text
    • https://cdn.sqhk.co/resilano/iiqgdgg/directv_now_customer_service_telephone_number.pdfIn PDF document text
    • http://websecurer.tech/engagement_invitation_template_online_freeczzhm.pdfIn PDF document text
    • https://cdn.sqhk.co/gexedamej/qgd2Phi/63468990586.pdfIn PDF document text
    • https://cdn.sqhk.co/wadupaxi/ihgehcd/download_car_simulator_veneno_mod_apk.pdfIn PDF document text
    • http://gromstroy.com/fovokodevopajatezogemigs9rhn.pdfIn PDF document text
    • http://detonic-de.website/24640701464g1zpk.pdfIn PDF document text
    • http://netlysy.online/xomujupos42xnn.pdfIn PDF document text
    • http://mebelrostov.ru/nilopadesajepamodes2lf8.pdfIn PDF document text
    • https://cdn.sqhk.co/dafisuwikib/heKHif4/scp_builder_bear_song.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/griffith_experiment_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/why_is_sex_and_the_city_series_not_on_netflix.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_off0000e78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78C 5076 bytes
SHA-256: 92b59aadc2cbec3df264953da70ffc6d744b4016bb892ff2ed8f065f06fedbc8
font_01_sfnt_off0000f8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D0 10000 bytes
SHA-256: 46a5424d8dd01bc6698558b965ee4be114485c9817135a1cbbb36fa617d5dd2a

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