Malicious PDF — malware analysis report

Static analysis result for SHA-256 25cc6c0324b20470…

MALICIOUS

PDF

83.8 KB Created: 2021-05-23 19:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6594480070140602cc3de460bc906f46 SHA-1: 1d7b1cbce58ab9dfd1dd0558850c286a8b9e76a9 SHA-256: 25cc6c0324b20470a3bfdc5725a60253be08db36cbdc90ff7eb6ea3898d9b3cd
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external links, including one to `dafemum.ru`, which is likely part of a link farm or phishing campaign. The document body, though heavily obfuscated, contains text related to 'Fahrenheit 451 quotes', suggesting a lure to direct users to the malicious URL. No scripts were extracted, but the PDF structure and link farm heuristic indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/strik?utm_term=fahrenheit+451+quotes+with+page+numbers+clarisse
    • https://static.s123-cdn-static.com/uploads/4366032/normal_600755e34ccd8.pdf
    • https://ginupegoforijef.weebly.com/uploads/1/3/4/7/134760486/ab1882a8.pdf
    • https://bofuvozera.weebly.com/uploads/1/3/5/3/135331850/595791870d.pdf
    • https://rokolumer.weebly.com/uploads/1/3/0/9/130969153/wafojer_tonupibosulu_gikebaxof_muwinufo.pdf
    • https://cdn-cms.f-static.net/uploads/4380691/normal_60517cd557367.pdf
    • https://cdn-cms.f-static.net/uploads/4366317/normal_605a406f935f9.pdf
    • https://static.s123-cdn-static.com/uploads/4393625/normal_5ff33f035eff8.pdf
    • https://cdn-cms.f-static.net/uploads/4419451/normal_604d34fec5f16.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wixatax/fukupolasi.pdf
    • https://uploads.strikinglycdn.com/files/ea50084e-26e9-4aba-ac3c-53f535d1753f/what_does_the_acronym_smart_stand_for_brainly.pdf
    • https://s3.amazonaws.com/limewub/75170945725.pdf
    • https://s3.amazonaws.com/wetevali/zewemelu.pdf
    • https://s3.amazonaws.com/nowonovege/23412469038.pdf
    • https://s3.amazonaws.com/rirusozo/carrier_debonair_220.pdf
    • https://s3.amazonaws.com/kudefem/as_10_icai.pdf
    • https://uploads.strikinglycdn.com/files/392ede73-7491-4246-92ca-a6b1edb59918/taxawuwavorerelogifu.pdf
    • https://s3.amazonaws.com/zonebon/financial_plan_report_sample.pdf
    • https://s3.amazonaws.com/gebukil/arthur_rimbaud_poesa_completa.pdf
    • https://uploads.strikinglycdn.com/files/8d5a78ca-f056-41e0-a125-0da93ae0d011/zazel.pdf
    • https://uploads.strikinglycdn.com/files/5b713c57-088c-427a-973a-e43a2e191e7b/honda_eu2000i_companion_generator_reviews.pdf
    • https://s3.amazonaws.com/zedilegol/boson_network_simulator.pdf
    • https://s3.amazonaws.com/pevuwarobuvowa/plato_algebra_2_unit_3_pretest_answers.pdf
    • https://uploads.strikinglycdn.com/files/97e3fc55-6df8-45a3-9246-e7ec3fc09ccf/i_am_jazz_book_publisher.pdf
    • https://s3.amazonaws.com/vuliwisuwig/92148690313.pdf
    • https://s3.amazonaws.com/risalenefazozo/unit_2_uniform_acceleration_worksheet_6.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103e8.bin
001cbe686bfd617fcdfad548e3341c867816e89f8c6cd137d47f85bf32279f55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103E8 5924 bytes
font_01_sfnt_off00011810.bin
ac05567c708c74bfe9682ec52af4b4dab7ec66b8f8628811a815aff5cbf1de37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11810 14716 bytes

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