Malicious PDF — malware analysis report

Static analysis result for SHA-256 cedd7f6507a6bd96…

MALICIOUS

PDF

87.7 KB Created: 2021-04-02 01:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8352cf444ece98c658c0293c43031485 SHA-1: 9e6652f67a6715df872ece34dc33a1e947c7d526 SHA-256: cedd7f6507a6bd96fa4537922f2236c0c64e14e4c805be538416a5d2e9f4e10f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are SEO-optimized and point to other PDF documents, indicating a link farm for SEO manipulation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://zajinet.ru/wix?keyword=rational+oven+troubleshooting+manual
    • https://natatujefeni.weebly.com/uploads/1/3/1/6/131607075/dojaloxilufaw.pdf
    • https://cdn.sqhk.co/zujubiviv/tjhibjc/tangled_2_movie_trailer.pdf
    • http://golulim.iblogger.org/how_to_backup_android_data_to_iphone.pdf
    • https://lopazilavorelid.weebly.com/uploads/1/3/4/0/134097689/e632c16a2.pdf
    • https://ninefajesazaga.weebly.com/uploads/1/3/5/3/135384029/8154878.pdf
    • https://tasakexer.weebly.com/uploads/1/3/4/6/134669330/8aca490f7335.pdf
    • http://julapekawej.22web.org/youtube_alan_watts_it_starts_now.pdf
    • https://ginadilu.weebly.com/uploads/1/3/4/7/134768391/5161b7cecb7a3.pdf
    • https://dodawuwaxa.weebly.com/uploads/1/3/4/3/134305805/zamerilagumiju.pdf
    • https://veminimuvaw.weebly.com/uploads/1/3/4/6/134630651/6723587.pdf
    • https://cdn.sqhk.co/dekavaka/xmQicRa/57292734907.pdf
    • https://cdn.sqhk.co/gexedamej/Fwhak2F/60424314231.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4461694d-a6f7-4a69-895a-ff5ddeb3c622.filesusr.com/ugd/f504fb_240aa91973d24ff9b8179b489ff7cbd5.pdf?index=true
    • https://7835c217-6b95-46a1-915a-76cdebae3fe0.filesusr.com/ugd/debfb4_885850e78d4944cabb36ba4b25371961.pdf?index=true
    • https://uploads.strikinglycdn.com/files/14ee9db7-b414-4386-a21f-84938405df2b/64239132906.pdf
    • http://tabolamekosedu.epizy.com/tusuruw.pdf
    • https://uploads.strikinglycdn.com/files/7ee130e2-dfb9-475b-9c07-486e0b0d8314/samsung_soundbar_hw-j550_subwoofer.pdf
    • https://uploads.strikinglycdn.com/files/03f1d464-518a-44b4-8fe3-e77d727404d6/36729282890.pdf
    • https://uploads.strikinglycdn.com/files/d3d0d39b-d57d-41ec-acd7-684869c9525b/99196788317.pdf
    • https://uploads.strikinglycdn.com/files/86681c2b-ddea-4ae6-9003-36ee0e17cbf9/94224694359.pdf
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_fe5266a7f4d84c2fa03e7cae5da126e0.pdf?index=true
    • https://484a0fbd-04e0-416f-b335-41eb3f66808b.filesusr.com/ugd/228afb_4c7c1f294af744b2999eaff855e541a2.pdf?index=true
    • https://7722bba5-72ad-4d15-a72d-9ce9fbdcf1b5.filesusr.com/ugd/772ad5_8cc68f9c1cdb491eaba83f799493e276.pdf?index=true
    • http://repofifimi.epizy.com/tulafipove.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff94.bin
4ccc6d8bb5b0f70c57cd18dfb6b2b60add8a667be49358b23c4b847c2a89ddff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF94 5304 bytes
font_01_sfnt_off00011181.bin
5f7efda72b03e50ef8ea9f4fb33f44ca32630752b47278ab4a3bce4784aeb618		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11181 12124 bytes
font_02_sfnt_off00013a4d.bin
a7244f0758c425957231d055135a2eb3962ab34496e97f01b02d05619f4dcd7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4D 16096 bytes

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