Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc374f1992e6a94…

MALICIOUS

PDF

75.9 KB Created: 2021-03-31 04:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: aafc87ce511a7e124cb3ec66b927c0b4 SHA-1: ff140f0e1b9bbd6481c419629e0d22f413581572 SHA-256: 5bc374f1992e6a940773bb5d7ce0e0fba40f5c2327780ab389adf326d629cf18
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier. It contains numerous embedded URLs, with one pointing to 'nipisod.ru', suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated, but the presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, further supporting a malicious intent. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://nipisod.ru/wix?keyword=workman+hp201s+manual PDF link annotation
    • http://zoziwasikow.22web.org/buvelubesagesunuwi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446390/normal_602a14234bd1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495413/normal_6063b46b40741.pdfIn PDF document text
    • http://fokojudup.22web.org/28807213162.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424007/normal_5fd99957d09b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367627/normal_5fe5383c5a8e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412896/normal_5febe4f8ba577.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/juwofuxufijup/mujizen.pdfIn PDF document text
    • http://dajasunekufa.epizy.com/causes_of_the_second_anglo_boer_war.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1797645b-bc5d-4e0e-b445-ad735ca16960/41886683495.pdfIn PDF document text
    • https://fb9345b8-40be-4608-a8ff-9c5427dba92f.filesusr.com/ugd/98d639_e7b9cbf7a82147c6a7d418acc6611bac.pdf?index=trueIn PDF document text
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_b542edadfa514916b244c9a3a66e5f9b.pdf?index=trueIn PDF document text
    • http://bezukovopobav.epizy.com/nugabalobiguzegu.pdfIn PDF document text
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_abf702951cf941f7a2bb3ef42d41e791.pdf?index=trueIn PDF document text
    • http://putiremupupunis.epizy.com/big_fish_games_settlement_claim_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/037fa735-04df-4465-af47-8b1d2ebdd10c/bloodlines_richelle_mead_book_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11fff2e7-9811-4092-bba8-3be476466f0f/fejoguzipenedi.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/transfer_iphone_contacts_to_android_using_icloud.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_off0000d73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73D 5096 bytes
SHA-256: 0163d462e95edf5f0a96a34a8bc117e7db8e76f9c256989b68b73cb4372b6dc5
font_01_sfnt_off0000e85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85B 12900 bytes
SHA-256: 77b571d32abf7df16816fa35fc7fbf52076945208a724fe582ba400d9455d3c3
font_02_sfnt_off0001130d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130D 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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