Malicious PDF — malware analysis report

Static analysis result for SHA-256 a346eec730194423…

MALICIOUS

PDF

83.2 KB Created: 2020-11-22 05:07:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cba27354458c0a3412a3c0c6d3e03fc2 SHA-1: a5907087b56e62f50d410cb02bf81b5cfb477c16 SHA-256: a346eec73019442336b4aa97344af800c0b01231cedbcd7715a7fd4a6270c88b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, and is flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. One of the primary external URIs, https://traffset.ru/aws?utm_term=auto+clicker+for+android+free, suggests a lure related to 'auto clicker for android free'. The presence of embedded JavaScript, though not fully detailed, indicates potential for malicious redirection or exploitation. The file's structure and numerous external links strongly suggest a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffset.ru/aws?utm_term=auto+clicker+for+android+free
    • https://cdn-cms.f-static.net/uploads/4459029/normal_5fb3d43a086db.pdf
    • https://cdn-cms.f-static.net/uploads/4484380/normal_5fb730ebee065.pdf
    • https://cdn-cms.f-static.net/uploads/4368467/normal_5f89ea2cb1711.pdf
    • https://kazofinuso.weebly.com/uploads/1/3/4/3/134369681/berakubaroxi_fojugudepofat_debilugu.pdf
    • https://cdn-cms.f-static.net/uploads/4474978/normal_5fa726be50fad.pdf
    • https://cdn-cms.f-static.net/uploads/4452193/normal_5fad4d94dbcdd.pdf
    • https://cdn-cms.f-static.net/uploads/4416502/normal_5f9e2092cf28a.pdf
    • https://cdn-cms.f-static.net/uploads/4365660/normal_5f870087d052c.pdf
    • https://cdn-cms.f-static.net/uploads/4369496/normal_5f9c3daf0ddf3.pdf
    • https://cdn-cms.f-static.net/uploads/4417659/normal_5f9bcfc12750c.pdf
    • https://cdn-cms.f-static.net/uploads/4387233/normal_5fad819d58655.pdf
    • http://www.opentle.org
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f7df2389-2256-4ff5-9c2c-87e13d163e36/job_abandonment_letter_shrm.pdf
    • https://uploads.strikinglycdn.com/files/a419165c-cca6-4288-a51c-72ece850e4f7/todojopalokovedofe.pdf
    • https://s3.amazonaws.com/pexodugosa/katutubo_at_hiram_na_salita_worksheet.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://www.gnu.org/licenses/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000fc0e.bin
375ce75fbede132abc607a1579ac965fb2ea1a04d2b4482ed2b33590d3995596		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFC0E 12716 bytes
font_00_sfnt_off0000eb65.bin
0de150cb3b15eb9a526eb6b763a962b1b4c6d377d9e71431d66b73f2364e7e5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB65 4888 bytes
font_02_sfnt_off00012021.bin
ae6832d5888083fe0486aa4e8723f0372f4ec25c02a1e3413b5ca9eaa07262a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12021 10272 bytes

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