Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7dfe575b1962147…

MALICIOUS

PDF

87.9 KB Created: 2021-01-11 15:14:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7f4439f8260aa8b88f9c2282c7df521f SHA-1: b0727322a8411bedb6935a641a646ddd4d786ae7 SHA-256: a7dfe575b196214766ee3aa484bdda8e5456b564c06d1de2576d4f7596d297d3
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to other PDF files, which is characteristic of a link farm or SEO spamming operation. One of the embedded URIs, 'https://traffking.ru/aws?utm_term=green+grow+the+rashes+o+sheet+music', suggests a potential phishing or malware distribution lure. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest this document is part of a campaign to drive traffic to malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=green+grow+the+rashes+o+sheet+music PDF link annotation
    • https://cdn.sqhk.co/rukeditele/tdWjhjf/37324070118.pdfIn PDF document text
    • https://numuzobiw.weebly.com/uploads/1/3/4/5/134589566/wazulogedaladosof.pdfIn PDF document text
    • https://site-1173223.mozfiles.com/files/1173223/ravensburger_puzzle_storage_carry_case.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470537/normal_5fe50bccb3840.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369901/normal_5fc811a9eb790.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382421/normal_5fceaa679cf7a.pdfIn PDF document text
    • https://tukibasitotaz.weebly.com/uploads/1/3/4/4/134445351/tojusatimovutiw-worujewiji-faxujenuwa.pdfIn PDF document text
    • https://site-1177364.mozfiles.com/files/1177364/download_game_stickman_football_2016.pdfIn PDF document text
    • https://cdn.sqhk.co/mawejoxejobe/igcnbXI/wezunibupupopixusezi.pdfIn PDF document text
    • https://zabugejagovim.weebly.com/uploads/1/3/1/6/131637755/niwizesinezawavikego.pdfIn PDF document text
    • https://vetinuvejozijuk.weebly.com/uploads/1/3/4/7/134745319/f41102c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450354/normal_5fa964e69c853.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456999/normal_5fcedcaab67cf.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
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011309.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11309 26324 bytes
SHA-256: 5f7357086f2c68dff266962dc013c12c518d8c8875164e7779291ebf8d80aebd
font_00_sfnt_off0000dcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF9 5184 bytes
SHA-256: d8c021dc2e6e2d03f0dde37955b240228595c9d9018041ca213b5de14adbe6e8
font_01_sfnt_off0000ee89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE89 10532 bytes
SHA-256: 894d899c744825eff7c050b4e0793ca77a015c15593825c522ca6e22b15a308c
font_03_sfnt_off0001419d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1419D 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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