Malicious PDF — malware analysis report

Static analysis result for SHA-256 789d44186a908e0b…

MALICIOUS

PDF

68.3 KB Created: 2021-02-02 16:54:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 20b1287b0d10424b427ddfde76fea069 SHA-1: d274f5fb6df4a9adcb216b7718fd9a2a4ad0acbb SHA-256: 789d44186a908e0bf3d67ba5e7e636f62ae7f3b6efa5b5d7528002c9792d15f7
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious or spam-related domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_URI' heuristics. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score further support its malicious nature. The document body, though heavily obfuscated, suggests a lure related to 'Google chinese translator', likely to deceive users into clicking the embedded links.

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://maypoin.ru/wb?keyword=google%20chinese%20translator PDF link annotation
    • http://kogovokuriboti.22web.org/rababuxefofunimizat.pdfIn PDF document text
    • https://butevexonukuzi.weebly.com/uploads/1/3/2/6/132681970/4d21235b445.pdfIn PDF document text
    • https://vesixogis.weebly.com/uploads/1/3/4/8/134863987/xovovoxopa.pdfIn PDF document text
    • https://vipogonegope.weebly.com/uploads/1/3/0/9/130969266/1a7703d.pdfIn PDF document text
    • https://gobodukigibab.weebly.com/uploads/1/3/1/8/131856162/denapodusapofun-gabider-depikirapedo.pdfIn PDF document text
    • https://pejilajapife.weebly.com/uploads/1/3/4/4/134477767/d19b33e54be4b.pdfIn PDF document text
    • https://pigumetazemebet.weebly.com/uploads/1/3/0/7/130775485/sufupobasu.pdfIn PDF document text
    • https://jasujoru.weebly.com/uploads/1/3/1/4/131483343/a2347c8.pdfIn PDF document text
    • https://kevonixoxudunu.weebly.com/uploads/1/3/0/7/130775897/6aceee764.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/brenntag_annual_report_2009.pdfIn PDF document text
    • http://tewidunutazi.rf.gd/51464196655.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/formation_bartender_prix.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/womakogizidotasisovavisi.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/calendario_liga_espaola_2018-_19.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/brothers_in_arms_cheat_codes_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/mcgraw_hill_connect_organizational_behavior_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/gopro_hero_5_firmware_2._0.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_off0000cf69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF69 5092 bytes
SHA-256: 89d03841e97d472f7dbcd1a6bb288f86a1fd1d2952916c2029e101421ee6b1ca
font_01_sfnt_off0000e0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B9 10572 bytes
SHA-256: bd2a5a2a6b809f00c56a5483fdd65fea35cd47a14f1ea76ca66ff727945252e7

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