Malicious PDF — malware analysis report

Static analysis result for SHA-256 30f6e22db36729da…

MALICIOUS

PDF

74.7 KB Created: 2021-05-25 17:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7eec3ccb37f89b3621b1a5ec6b7b722b SHA-1: 2e9aad8e67f4408eebbcbed0aa48f1fd0a2cb801 SHA-256: 30f6e22db36729dab64802693d416b19a4a65c9be3e61f5d35545ed38bd2ce92
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that directs users to a suspicious domain, likely to deliver a malicious payload or phish for credentials. The document body, though heavily obfuscated, suggests a lure related to an 'answer key pdf'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • 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://nipisod.ru/strik?utm_term=market+leader+elementary+answer+key+pdf
    • https://static.s123-cdn-static.com/uploads/4387821/normal_5fe1ad902f954.pdf
    • https://zunuduzeguw.weebly.com/uploads/1/3/4/3/134344012/kaluxiwela.pdf
    • https://cdn-cms.f-static.net/uploads/4387035/normal_601b60272719d.pdf
    • https://joxegozul.weebly.com/uploads/1/3/1/0/131070165/pibotamiker-viterozonuzilif-mapajezu.pdf
    • https://cdn-cms.f-static.net/uploads/4391893/normal_60225b6d73127.pdf
    • https://cdn-cms.f-static.net/uploads/4373992/normal_6064e94f65e8b.pdf
    • https://gofutetawavoror.weebly.com/uploads/1/3/0/8/130874623/8839499.pdf
    • https://cdn-cms.f-static.net/uploads/4462678/normal_601b3c5f30fbb.pdf
    • https://bawilawuvibowe.weebly.com/uploads/1/3/4/4/134401702/bewebujagikumoxuveda.pdf
    • https://static.s123-cdn-static.com/uploads/4458633/normal_6008c8c6bf0ce.pdf
    • https://static.s123-cdn-static.com/uploads/4366374/normal_5fc8c589ed664.pdf
    • https://static.s123-cdn-static.com/uploads/4369926/normal_6008c8094b002.pdf
    • https://cdn-cms.f-static.net/uploads/4499329/normal_6044239606c1f.pdf
    • https://static.s123-cdn-static.com/uploads/4388041/normal_5fe19b6bd665a.pdf
    • https://cdn-cms.f-static.net/uploads/4422135/normal_604fbe18ce148.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1e71a44e-42ce-464e-8253-5d62b4ab8b66/satimutumipetidos.pdf
    • https://uploads.strikinglycdn.com/files/9f0639d5-f744-4953-aa26-95aad6059b2e/computer_hardware_engineer_jobs_in_chennai.pdf
    • https://s3.amazonaws.com/votawawo/feperepofukixepomexef.pdf
    • https://uploads.strikinglycdn.com/files/de5f9a40-c354-4ea9-89ef-a239c8a047a1/75601061125.pdf
    • https://uploads.strikinglycdn.com/files/7610a6d1-aa7d-4bbe-ae06-7c83912346b9/sequences_review_worksheet_answers.pdf
    • https://uploads.strikinglycdn.com/files/c171619a-8772-4fa6-bd2e-49606f07addb/pofalotiratenajuwufuk.pdf
    • https://s3.amazonaws.com/rixevozajixezos/pawelufebizixikejevuri.pdf
    • https://s3.amazonaws.com/farefasejikap/2012_ibc_seaoc_structural_seismic_design_manual_vol._4.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_off0000dce1.bin
c333fa31aa7849f22be3673f728c168263779eae18421662494bd6f3dc9529f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE1 5448 bytes
font_01_sfnt_off0000ef7b.bin
67c7225f5b3552dc9159e5e418c63f2ad092ff36d6a7600576212d325d679111		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7B 18300 bytes

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