Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22253fedb56348f…

MALICIOUS

PDF

79.1 KB Created: 2021-04-01 21:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e0df6b1c6948f06f70250e786a21af71 SHA-1: 72a680d1c2c86c207dc48c759ccfad5ede870fa2 SHA-256: a22253fedb56348f33e4cc025783f2e76293a7e61624eee177addc40e37e1b81
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan threat. It functions as a link farm, containing numerous external URLs, with one prominent URL being https://maypoin.ru/award?keyword=hamlet+pdf+biblioteca+virtual+universal. The document's structure and embedded links suggest an attempt to manipulate search engine results or redirect users to potentially harmful content.

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://maypoin.ru/award?keyword=hamlet+pdf+biblioteca+virtual+universal PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452398/normal_6037d588b43ad.pdfIn PDF document text
    • https://jakipafowikodo.weebly.com/uploads/1/3/1/0/131070805/f4af38b73eb.pdfIn PDF document text
    • http://vulifux.66ghz.com/lymphatic_system_anatomy.pdfIn PDF document text
    • https://zomudefe.weebly.com/uploads/1/3/0/7/130740133/kexogixemovu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457592/normal_5fd5f600ba7b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403804/normal_60170ac8c7866.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403940/normal_605bb3d1d6027.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487423/normal_60134b2e240ba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/el_arte_de_la_guerra_scribd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb752364-ae10-4c5d-9977-252a1203291e/90193823184.pdfIn PDF document text
    • http://tazefuwavubu.rf.gd/english_hip_hop_dance_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/041bc156-aefa-43b8-b8c3-20b07bfcbb4d/crosman_1077_repeater_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa062961-bbe2-4a1b-b419-90690f7aefd5/what_is_the_theme_statement_of_the_cask_of_amontillado.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/ave_maria_gounod_soprano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a9c5a10-640b-4c05-8b00-6f0f4c1de369/xepepavawanidet.pdfIn PDF document text
    • http://nejegidijikoj.epizy.com/30223115856.pdfIn PDF document text
    • http://gagolugumetuvo.epizy.com/57553471040.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/data_structures_and_problem_solving_using_java_4th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e46d1926-c76e-4b54-9fb2-f74978d86aa2/how_to_make_cream_of_tartar_for_playdough.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE684 5344 bytes
SHA-256: 91dd320b581a4f311d113f7b26d995b54fed65dea61f362640a14859a9a663df
font_01_sfnt_off0000f89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89A 11900 bytes
SHA-256: e13e13d79ff8f20e28c26e8edeb9738e09e49b969f8ba40266bd7b0ac3225674
font_02_sfnt_off00011f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F31 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e