Malicious PDF — malware analysis report

Static analysis result for SHA-256 647f9d82fdabd634…

MALICIOUS

PDF

77.1 KB Created: 2020-12-19 11:44:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 046ea040cb5a0accba9d469e6604f0a8 SHA-1: e7fed55d0bc79493955c5eb8655844329da1f44a SHA-256: 647f9d82fdabd634b8472e24d25ce9331df1ae93fc9faa3d2dad7fa4d99f5e8d
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous external links, with one pointing to 'trafffi.ru', suggesting a phishing or malware distribution attempt. The presence of PDF_SEO_LINK_FARM indicates a large number of outbound links, a common tactic in SEO poisoning and phishing campaigns. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/strik?utm_term=fossil+creek+waterfall+permit
    • https://lipebelotoj.weebly.com/uploads/1/3/4/4/134475440/9918154.pdf
    • https://vafomelopujoxo.weebly.com/uploads/1/3/4/8/134864043/58725.pdf
    • https://xuwixozewinufub.weebly.com/uploads/1/3/4/7/134702679/zopebuvit.pdf
    • https://saniluje.weebly.com/uploads/1/3/4/3/134323688/xebosujex-ziripuvukekelu-zidulu-jupimosileziluw.pdf
    • https://takotowi.weebly.com/uploads/1/3/4/3/134356266/dexabekavimopo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fcec193efaa704a0f57ff49/t/5fd66666acac596b0cbb085f/1607886444303/jikobavu.pdf
    • https://static1.squarespace.com/static/5fdc7d509de11a3bcb749b5f/t/5fdcc21237b4b65891780d74/1608303122657/bitsat_2018_paper_free.pdf
    • https://s3.amazonaws.com/numegubowalonan/construction_project_closeout_template.pdf
    • https://static1.squarespace.com/static/5fc4eeaca5bc066edfbf657c/t/5fce76f3969a747543a0bd92/1607366389424/rtvc_haiti_en_direct.pdf
    • https://s3.amazonaws.com/dazuxujepov/dodge_charger_police_car_hp.pdf
    • https://static1.squarespace.com/static/5fcebf19997c4a779046214b/t/5fd6c50cb1c3f31c7a90f7a3/1607910669164/munawetiwivoreropaden.pdf
    • https://uploads.strikinglycdn.com/files/b5f399d6-2c43-42da-b3ed-17afb2eff8a6/dusudolusuwiweruzosoja.pdf
    • https://s3.amazonaws.com/wazorixekunafob/asuran_fight_bgm_music.pdf
    • https://static1.squarespace.com/static/5fc79f8343c5ee75bf2d4911/t/5fcade3564036b61438157a1/1607130678837/nerililoluvamodami.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_off0000e574.bin
771033003054101e9e87eceebec65dd17fac76109d4f476580acb9549e794e17		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE574 2968 bytes
font_01_sfnt_off0000f01a.bin
f4ddf5ec4a039fd5684362a4e7542a36ca82efa35067db7630f6550f422545e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF01A 5272 bytes
font_02_sfnt_off0001020f.bin
5a7d32a895ed5a51025dc2d31814dc03f7be28801d4d5d44350a3b38c386f09d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1020F 11056 bytes

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