Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ef35fd2efb0f3b…

MALICIOUS

PDF

125.6 KB Created: 2021-03-22 18:49:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d71fa9c6d045e07e5bb47a1174fe76d SHA-1: 6c7fdd798e2c0a28d174066829868e2c692ca3a5 SHA-256: 23ef35fd2efb0f3b7ff5920de8eb08fbd321d44b484ab7ef0714b72a1dfcc2a8
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or distribution point for further payloads. The document body, though heavily obfuscated, contains references to 'prayer guide' and application metadata, which are likely lures to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/123?utm_term=my+bsf+prayer+guide
    • http://item-get.top/examen_de_ingles_basico_online_gratisnbeur.pdf
    • https://nubugudapo.weebly.com/uploads/1/3/2/8/132814946/tekuzizabof.pdf
    • https://bixavovene.weebly.com/uploads/1/3/0/7/130775743/c8ace8a726742.pdf
    • http://hookup154.site/grim_dawn_fleshworkssshgf.pdf
    • https://lepovomika.weebly.com/uploads/1/3/4/7/134701686/miwibolisagon.pdf
    • https://kivuligob.weebly.com/uploads/1/3/0/8/130874143/xuterimezixazuwipa.pdf
    • http://consumer-data-protection-bureau.com/what_is_your_company_culture_likea4a8q.pdf
    • https://jotukodapoze.weebly.com/uploads/1/3/4/6/134632246/f0059.pdf
    • http://fortuneo.best/esp32_web_server_with_arduino_ideb7cs3.pdf
    • https://xolivura.weebly.com/uploads/1/3/5/9/135958321/7201426.pdf
    • https://fakazurirogedim.weebly.com/uploads/1/3/4/7/134743668/381a7.pdf
    • http://hardcreditcheck.info/tulafatalefopemozo5aidr.pdf
    • https://nurojitare.weebly.com/uploads/1/3/2/6/132682966/7902947.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/4bd85a01-e204-4c77-88ea-771de377be10/transition_words_for_your_second_body_paragraph.pdf
    • https://s3.amazonaws.com/bomupi/58796722163.pdf
    • https://s3.amazonaws.com/zidenigad/donubuxivaxizunizokef.pdf
    • https://uploads.strikinglycdn.com/files/9d78d10a-1de6-4619-9ec2-cf6f96aa3b08/what_is_principles_of_compiler_design.pdf
    • https://uploads.strikinglycdn.com/files/82cbb4e4-1042-42a3-b82a-5114dcb2a2c8/955841949.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a564.bin
5fe23dbe6db9ea85847c61bdf493ccc1517e0e56f24e0c24d25734e2416a51d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A564 5008 bytes
font_01_sfnt_off0001b67d.bin
73145b66db032aefa3c5081c60c4b405b502757c3e2a2ce7df3bf9fd123bb744		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B67D 10728 bytes
font_02_sfnt_off0001db23.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB23 4324 bytes

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