Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d88a6adc64e8f20…

MALICIOUS

PDF

67.8 KB Created: 2020-12-21 20:19:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: fe699c0e3f06205f1d35c5ad6d3c7919 SHA-1: 91786adcbde4deaef5fc5bdbb3cdf9f19512977a SHA-256: 9d88a6adc64e8f20ccd573b3e0deebe084b7867661ac5c4d7b96fc977eee6fd2
156 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 file identified as malicious by ClamAV and an ML classifier. It contains numerous external links, with a critical heuristic indicating a 'PDF_SEO_LINK_FARM' suggesting a tactic to generate traffic or distribute content. One of the primary URLs, 'https://traffking.ru/aws?utm_term=steps+of+isometric+drawing+pdf', is embedded within the document, masquerading as a technical drawing guide. While no scripts were explicitly extracted, the presence of external links and the 'Phishing.Trojan' classification strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://traffking.ru/aws?utm_term=steps+of+isometric+drawing+pdf PDF link annotation
    • https://palozemoxapido.weebly.com/uploads/1/3/4/3/134366311/bojisenokalak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476434/normal_5fca235d71970.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420459/normal_5fb714cb447e9.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/ff61cdae-3318-4418-9515-e7fe5083d6c3/52244293305.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/203b7cfd-d5e9-4144-9a3c-483af577f6b6/bait_and_hook_restaurant_cokato_minnesota.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb203afc-17d9-49e9-88da-65d419ab8681/bartali_s_adventure_log_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/bleacher_report_draft_day_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/hold_on_alabama_shakes_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01e34974-52cd-4a8d-bbdc-25e8aeb626d0/level_e_vocab_workshop_unit_4_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/144d4d19-df2b-4feb-bbda-60f6743698bf/pujesitoxinodotupi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5701317f-fd41-4ad8-8a72-796543068a09/35471805439.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdd44de8580e136cdf53fe3/t/5fde3a018afbbc271756f6aa/1608399361729/atropine_eye_drops_davis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82d477f0-c6be-4423-b7fa-0a328384ba3a/36211989869.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_off0000ccb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB2 5640 bytes
SHA-256: 028198c56bc41b9237e134e002f5b5af13ce6fdc75a82b112b0fd489b6957508
font_01_sfnt_off0000dfe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE5 9988 bytes
SHA-256: cc542b380b0c9b6889efa2c0bdc08a1ac58942bb3ded7177bab400423c8590b9

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