Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d904ad68085f304…

MALICIOUS

PDF

102.7 KB Created: 2020-12-18 22:34:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 989703e078cf59ecd10903d5d2e25e35 SHA-1: 72cc5256166239eccc6ac9c263c945eca8884025 SHA-256: 8d904ad68085f30408e79a6ec36ad836449a94bee48214b76cd5bd39989d6578
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a heuristic firing for a "PDF_SEO_LINK_FARM" which indicates a large number of external links, with one prominent URL being traffnew.ru. The ClamAV detection as "Pdf.Phishing.Trojan" and the ML classifier output strongly suggest malicious intent. The embedded content, though heavily obfuscated, appears to be a lure related to a "Guitar hero smash hits setlist" to drive users to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://traffnew.ru/strik?utm_term=guitar+hero+smash+hits+setlist PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470218/normal_5fa4283c2c2ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406213/normal_5fc54f7e76400.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459935/normal_5fd3cc737c0fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369313/normal_5fbc3aaea767a.pdfIn PDF document text
    • https://wodanosivowifig.weebly.com/uploads/1/3/4/5/134593279/3cff6465af07d2.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://static1.squarespace.com/static/5fc4f926a879396864223f82/t/5fcc150ae43f2b00a89659be/1607210253596/64856468039.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a20c8838-b00e-4bf2-b565-af7aa9eb286b/segetagevumozifejesibu.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/xewawigop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16c64b49-e3ee-40d3-acde-2b437f85c2a5/vermilion_ohio_county.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/adding_subtracting_negative_numbers_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2e3fe88-cbbc-4fbc-86da-d1d0032120a6/uf_internal_medicine_residency_program.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53500988-dc05-448d-998c-7feb4c05ff39/teliwunagodudejopal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/177b923a-25c9-4e44-b52e-900c62ba6e12/oathkeeper_and_oblivion_in_kh3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42a421ce-cc7a-4b2e-8418-4d5fb94a0fe6/kingdom_hearts_re_chain_of_memories_sleights.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_off00014453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14453 4732 bytes
SHA-256: fbbb784475d7ae1faf28f42e053a25b5c566c3b6012dd9351185f29f5da32a61
font_01_sfnt_off0001546a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1546A 13724 bytes
SHA-256: dccf1cb491deae7564fe26b635a918ea064946396bd62d371f32b3a610b1c622
font_02_sfnt_off00017eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EEC 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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