Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b4fefd0ef7d132…

MALICIOUS

PDF

85.3 KB Created: 2021-03-13 16:18:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4efc9cd018039041e6ea49a624af5a5a SHA-1: 29abb203f8237edf3b16f25836427a9006a16e6f SHA-256: 99b4fefd0ef7d13258f1ffee97eef427c0a8cf9340eb35f8f1a33eead6d0f771
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains a large number of external links, many pointing to PDFs, suggesting a link farm or SEO poisoning tactic. The primary URL, https://midufefew.ru/award?keyword=altered+carbon+livro+pdf, indicates an attempt to disguise malicious content as a search result for a book, likely to trick users into downloading further payloads or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://midufefew.ru/award?keyword=altered+carbon+livro+pdf
    • https://cdn-cms.f-static.net/uploads/4424692/normal_6033a4622af10.pdf
    • https://static.s123-cdn-static.com/uploads/4426966/normal_60029dac4859a.pdf
    • https://cdn.sqhk.co/zozijawutuxu/ejh13gU/computer_launcher_8._11_mod_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4454301/normal_603e9e7820aec.pdf
    • https://sufafiderek.weebly.com/uploads/1/3/0/8/130814754/sufuter.pdf
    • https://cdn.sqhk.co/noxavuris/hajaijH/3917530236.pdf
    • https://surujesuf.weebly.com/uploads/1/3/4/7/134773125/4516164.pdf
    • https://cdn.sqhk.co/semoxumid/cgjwRja/zopukejibixijowadove.pdf
    • https://cdn-cms.f-static.net/uploads/4450248/normal_601af4211652a.pdf
    • https://cdn.sqhk.co/romilononove/AjiFCrh/ben_10_heroes_united_turkce_izle.pdf
    • https://cdn-cms.f-static.net/uploads/4462974/normal_603fd442754df.pdf
    • https://cdn.sqhk.co/vazoguzo/cngjEic/jidaxezewifege.pdf
    • https://static.s123-cdn-static.com/uploads/4383805/normal_5fefc2fe0410d.pdf
    • https://cdn.sqhk.co/woteruzid/jjBx2p4/refoge.pdf
    • https://tewiwumorivare.weebly.com/uploads/1/3/1/4/131409909/5404315.pdf
    • https://cdn.sqhk.co/kanemili/cYjhgjb/4237004410.pdf
    • https://static.s123-cdn-static.com/uploads/4426945/normal_5ff7985f8c2e3.pdf
    • https://mefupawex.weebly.com/uploads/1/3/4/3/134317460/vagumot.pdf
    • https://cdn-cms.f-static.net/uploads/4384304/normal_60188d460684c.pdf
    • https://guretaximijogu.weebly.com/uploads/1/3/0/7/130739376/2927151.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/babetafaperaxov/dell_latitude_e6430_price_i7.pdf
    • https://s3.amazonaws.com/sefabe/zenivulotezurirufidib.pdf
    • https://s3.amazonaws.com/zagapaxa/1692773739.pdf
    • https://s3.amazonaws.com/vuterijoze/96575179944.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0cf.bin
077c9d1f363836090044d8ec301bdccd8b8f2633f8e7cad60cdae01df5771239		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CF 3044 bytes
font_01_sfnt_off0000fba3.bin
e212fd2de54b54035ba4afb528e7ffc83f1596e1597f3430a4234d08cc769def		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA3 5160 bytes
font_02_sfnt_off00010d48.bin
b5a4ebea9ae57c617eb579389fbea1a6b1db8b90a87a6ec0a3b881f8354e9e74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D48 10280 bytes
font_03_sfnt_off000130bc.bin
713933360072c9d59346590fad668f98c3603c6d2b72ed941ce85481f6af0b74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130BC 16060 bytes

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