Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe42a8e12d37e7b5…

MALICIOUS

PDF

80.2 KB Created: 2021-03-28 20:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 624ac7449cbdf0c5cecc3ec812e23a43 SHA-1: a95cdb762d0a686633d2e1f2bc9c6c0a5d6b25bf SHA-256: fe42a8e12d37e7b539cac6543e5edba4cf0ddd9497da93d05b9968e56c9e5575
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure indicate an attempt to lure users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/award?keyword=agatha+christie+poirot+investigates+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4444626/normal_5fcb5dfc8b5de.pdfIn PDF document text
    • http://zuxenegobepejij.22web.org/numpy_random_multivariate_normal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459477/normal_604223a311e2e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453102/normal_5fde83bc5e439.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473415/normal_5fe400b12dfb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383138/normal_6021f8607439e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_4c2d81f4cf6f4ea1b9f229a562e87ac6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a04654e-1705-4978-9d79-0a13e530c3fe/what_is_the_tone_in_sonnet_116.pdfIn PDF document text
    • https://5862e4ea-63a6-4c92-af93-e06d02d1a664.filesusr.com/ugd/eaa371_23ca5f492e124089ad89e5f987af57e1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a658fc7-1e35-4b01-9476-1a5a6eacd0dd/jarefixivupatilugagetin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20bf5018-d2e1-4914-a496-af70d62833af/how_to_make_a_wellness_recovery_action_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/22976349945.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6af908a4-982f-432b-a475-aa4c15cec723/vawejulugogitojanezim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fee1a1b-30e8-4196-a5c0-1780259addb8/xisalavemoweloxunarenemi.pdfIn PDF document text
    • http://sopixixu.epizy.com/can_a_marine_wear_a_navy_seal_trident.pdfIn PDF document text
    • http://wezekopufoj.rf.gd/fitted_sheet_target_au.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed4c0a75-dc1e-4701-8659-12085dd6b94b/vaxupazedelakadunudo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31911c41-8e6f-4f7b-8230-b56ba105fef8/beethoven_piano_sonata_no._10_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f633bf0d-63ef-427c-9f28-7f3d3777b70c/87930688334.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/hs_bremen_bachelor_thesis_format.pdfIn PDF document text
    • https://6184de0c-c318-42a7-882e-c5ddc63b817d.filesusr.com/ugd/1c8c1e_e4b348b307484bf39fd6f93c18444fca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6a79518-a787-46f3-88cf-f7228514e545/cbt_anxiety_worksheets.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_off0000f843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF843 5436 bytes
SHA-256: e945ba264d74962457dce70a1dfb34d5050ceb195e5ffa83370cba5aac5592c7
font_01_sfnt_off00010aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACA 13116 bytes
SHA-256: 19e47e42418cba07de3b56976096547cea1dcff4d9f35a668c0bd04424b43a64