Malicious PDF — malware analysis report

Static analysis result for SHA-256 a478a5075afb88f2…

MALICIOUS

PDF

83.0 KB Created: 2021-01-09 23:32:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: fab4fb41f3ed5962ca10a5c12143e6c1 SHA-1: d2ed0aa67ec0c1a81b4392daf4f54bb1c14f15bf SHA-256: a478a5075afb88f217d9374b4e465cca017c0ab7b1e615df937ed10dc0d9520c
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, but the presence of numerous links suggests an attempt to lure users to external, potentially malicious, sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/aws?utm_term=bisection+method+c+code+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4412387/normal_5f9d7ac5e3795.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411919/normal_5fc1a8eb738ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414701/normal_5fd70cfd2fb13.pdfIn PDF document text
    • https://site-1176145.mozfiles.com/files/1176145/ski_jumps_in_wisconsin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421330/normal_5fbc33b61ba5e.pdfIn PDF document text
    • https://site-1177793.mozfiles.com/files/1177793/sentinels_of_the_multiverse_expansions.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498978/normal_5fdf97bf988ef.pdfIn PDF document text
    • https://sobemifukoku.weebly.com/uploads/1/3/4/8/134887972/kijaxemajubulibek.pdfIn PDF document text
    • https://wuwawibef.weebly.com/uploads/1/3/4/6/134608234/bisixanusab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393772/normal_5f9694103b7ae.pdfIn PDF document text
    • https://dojeviwenos.weebly.com/uploads/1/3/4/4/134491393/2b6aafdc.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://s3.amazonaws.com/kovozenamofox/4th_grade_pre_algebra_math_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/sd_governor_noem_chief_of_staff.pdfIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/cia_comrade_in_america_english_subtitles.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/tenevavoda.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/filmic_pro_cracked_apk.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_off0000f62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62A 4892 bytes
SHA-256: d23d8aaa0b0bf0aa855fb58ba0f2a8d16c49bde04795821db9a04db008db41a0
font_01_sfnt_off0001069e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069E 12444 bytes
SHA-256: 7a13ae39956b575503c86ee0e364702a458a2c7270efa72381bd02c47590d97f
font_02_sfnt_off00012f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F50 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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