Malicious PDF — malware analysis report

Static analysis result for SHA-256 81411659837c3cb7…

MALICIOUS

PDF

81.0 KB Created: 2020-12-22 12:43:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c9fe9286ca4c20fbb93f1c85c33c7ff9 SHA-1: 586081cada6fdde0e0fa5adfda3e924620285207 SHA-256: 81411659837c3cb77f19f2581cf0e341bd40261a00e767f90b734fd545e751d2
116 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. Heuristics indicate it contains a callback phishing lure, prompting the user to call a phone number. An external URI pointing to 'trafficel.ru' was extracted, likely part of the phishing infrastructure.

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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://trafficel.ru/strik?utm_term=transfer+station+hours+of+operation PDF link annotation
    • https://lekomuge.weebly.com/uploads/1/3/4/7/134773229/depimimid_midamupuxaku_jugejarikatiwe_rirefujuver.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456989/normal_5fa5b639e60d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416136/normal_5f98b1a42fa6d.pdfIn PDF document text
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/2236988.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471253/normal_5fa8fec93663c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369498/normal_5fb5c9e81684a.pdfIn PDF document text
    • https://nulokoset.weebly.com/uploads/1/3/4/4/134447361/migapow.pdfIn PDF document text
    • https://jirukikemika.weebly.com/uploads/1/3/4/3/134310088/gopemuzosed_jupuvesiki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fabea0e-9618-4001-b837-4fd8afd53fa0/cj4_pilot_training_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbc1a0df-8304-4ddd-b17b-8d9fa0ed9b5b/dragon_ball_super_episode_124_subbed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6da75c17-f96e-4c88-a872-12c8106c2d48/angle_addition_postulate_definition_formula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/981be870-666c-4ea7-bb49-900c7377afee/tuxasuxisafu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d686ef03-8360-4fa4-a997-9524086372c6/john_wick_mp4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb42826f-d111-40eb-be63-f33a928b48f4/mtd_white_lawn_tractor_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d4cce23-1016-4230-8ca2-fd4ff87e09fd/19242831516.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/medevobusozogafawoxirusir.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_off0000fec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC6 4908 bytes
SHA-256: 0a8024d74bff87e01e110285f0257b2a1ea2dfeee6c748a52a855105efdb1147
font_01_sfnt_off00010f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6C 12136 bytes
SHA-256: 5c93f82cb04c7611e0f64b3184902d30c1238f12a7adecc35e6097a91b927a7b

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