Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b00d520cd959e49…

MALICIOUS

PDF

99.7 KB Created: 2021-03-23 05:39:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3f804d0f2776b652bd8aebeb5692fd1 SHA-1: dd596a3430386b369e0460068d9f53e39aa8abdf SHA-256: 2b00d520cd959e49326dc6f2fb2c0554476bde46dcbd8fcd6c342735f0628def
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms and phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs, such as 'https://nipisod.ru/123?utm_term=assassin%2527+s+creed+2016+dual+audio+720p', are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/123?utm_term=assassin%2527+s+creed+2016+dual+audio+720p
    • http://zufutefej.22web.org/87203586387.pdf
    • https://fipamowusaki.weebly.com/uploads/1/3/4/8/134879766/nolitukaz.pdf
    • https://static.s123-cdn-static.com/uploads/4449618/normal_5ff51c1101e76.pdf
    • https://static.s123-cdn-static.com/uploads/4467577/normal_5fc60c4ad7ca1.pdf
    • https://static.s123-cdn-static.com/uploads/4380237/normal_5fef98b323c74.pdf
    • https://nepubodi.weebly.com/uploads/1/3/4/6/134610278/7ec56a4289e4c.pdf
    • https://static.s123-cdn-static.com/uploads/4458412/normal_5fed1da77d228.pdf
    • https://jinezivatu.weebly.com/uploads/1/3/4/6/134687025/wumekamojujo_sipiwibopitowit_vizuvimaxegiboz.pdf
    • https://static.s123-cdn-static.com/uploads/4448718/normal_5ff57b364c0de.pdf
    • https://xoxatazafej.weebly.com/uploads/1/3/4/8/134861408/e5ae0cb2.pdf
    • https://cdn-cms.f-static.net/uploads/4421959/normal_60593cc4eb408.pdf
    • https://tigibivimibi.weebly.com/uploads/1/3/4/3/134344299/deleti.pdf
    • https://wufovepujiz.weebly.com/uploads/1/3/0/7/130775368/xosutiguje-miromag.pdf
    • https://radinake.weebly.com/uploads/1/3/1/8/131856095/f9aaa06aed11a69.pdf
    • https://cdn-cms.f-static.net/uploads/4498882/normal_6050db1c29fe9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.orgThis
    • http://www.fontrix.comhttp://www.nhncorp.com
    • https://uploads.strikinglycdn.com/files/66e34af6-9265-4c40-b88e-7f096c64faac/33438279832.pdf
    • http://likasiz.epizy.com/tovusorefoxazemija.pdf
    • https://uploads.strikinglycdn.com/files/9e5028cc-ec19-45b6-9460-2529652e11a6/bodyweight_training_program_beginners.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://scripts.sil.org/
    • http://scripts.sil.org/OFLAbyssinica
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb13.bin
3d4760ca295192c89086870ebbac49c5a5945404ea6ab57fca452cf2db5f569a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB13 6440 bytes
font_01_sfnt_off0000fb07.bin
b2bb5c4ef7e01711d96e0dde0bf8eda7a63eef667f3a5a86374a72ef2855897d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB07 5648 bytes
font_02_sfnt_off00010e57.bin
aa890c11d31957efca0fd402aa72a454fd9b4193136962196ca6c8da92cd1596		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E57 20968 bytes
font_03_sfnt_off00012e86.bin
04d00fe4d3d1cfb13f6c45ea00a1a16b92fe51d00c0709aca980b96f225372d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E86 2276 bytes
font_04_sfnt_off00013853.bin
113fed90b38c744a0badade0277a499dc58077a61bc3fdb27beae22bebae130a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13853 11144 bytes
font_05_sfnt_off00015e49.bin
2e46b36fed23876ebb6e11f7a152916482bd8967c060a582f04975efc8a71266		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15E49 2056 bytes
font_06_sfnt_off00016737.bin
213e803776634fc67bc8ad945e15daaee647097fae9af9fe9f57f081dd30af55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16737 16492 bytes

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