Malicious PDF — malware analysis report

Static analysis result for SHA-256 662566220491e40d…

MALICIOUS

PDF

62.9 KB Created: 2020-11-20 01:01:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c00c72bbaee720083e28e1593c901a9 SHA-1: 5489a0f30bf50c6ed12e37ca9d2b4ee87bb1147b SHA-256: 662566220491e40dea40b70b95bbcf6fd284b4130156180764c3b13adb37d8a6
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to a 'Presbyterian planning calendar 2018', likely intended to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://cctraff.ru/strik?utm_term=presbyterian+planning+calendar+2018
    • https://gogozugibijom.weebly.com/uploads/1/3/4/3/134369614/b28d249c200.pdf
    • https://juragubiv.weebly.com/uploads/1/3/0/8/130874328/bavotifa.pdf
    • https://nukewixe.weebly.com/uploads/1/3/4/3/134385223/mafisomese_gajifozigu.pdf
    • https://pimetagedipimop.weebly.com/uploads/1/3/1/6/131636886/vimalozugo.pdf
    • https://sufusazowuk.weebly.com/uploads/1/3/4/3/134311692/686537.pdf
    • https://nibuxapevu.weebly.com/uploads/1/3/4/6/134601724/4baf8020e.pdf
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/3417bd266854c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/najubu/11968365838.pdf
    • https://uploads.strikinglycdn.com/files/820581a3-c845-48c4-bedc-a9eefa8f7ca2/ap_physics_practice_workbook_book_2.pdf
    • https://s3.amazonaws.com/wukara/54202410705.pdf
    • https://s3.amazonaws.com/tetazino/roller_chain_guide.pdf
    • https://s3.amazonaws.com/lunojol/horizon_box_tv_guide.pdf
    • https://s3.amazonaws.com/saxefi/11339766005.pdf
    • https://s3.amazonaws.com/mejigavukolu/surviv.io_unblocked_games.pdf
    • https://uploads.strikinglycdn.com/files/20e7df30-9b47-4e30-be44-b371a3034398/53924157480.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b617.bin
0095d5e1219a6320679304e9b5fc23c5841ecc519321160547e9306a3315786c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB617 6004 bytes
font_01_sfnt_off0000ca9b.bin
e97d23afdf49ba822a9666515817d546eea2cf5f5cb70d79be51ec43443690e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9B 10600 bytes

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