Malicious PDF — malware analysis report

Static analysis result for SHA-256 24e9df72dbd65691…

MALICIOUS

PDF

72.1 KB Created: 2021-04-02 13:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4b9785027c85069da69b7ce51c2a295 SHA-1: baefa2f7126b74e50211ab2d1913553be2c28195 SHA-256: 24e9df72dbd656913211d8cfaf4499d6eb9b8178ef1b241b570b8e38d8a960e9
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to artificially inflate search engine rankings. The primary malicious URL, 'https://resalured.ru/strik?utm_term=libro+de+historia+universal+pre+san+marcos+pdf', suggests a phishing or malware distribution attempt disguised as a search result for educational material. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/strik?utm_term=libro+de+historia+universal+pre+san+marcos+pdf
    • http://xuvalikamug.22web.org/rarixaneponusanusi.pdf
    • https://cdn.sqhk.co/puxedimuwo/mXjbrEb/66808797974.pdf
    • https://cdn.sqhk.co/vemupanilow/Mvpggii/loopnet_chicago_warehouse.pdf
    • https://cdn.sqhk.co/dasupejej/jdpMtgi/u_haul_u_box_coupon_code.pdf
    • https://cdn.sqhk.co/tidilotofuka/hiibRgi/109877661.pdf
    • https://cdn.sqhk.co/dugelabomaw/4jhjazc/wordans_gildan_sweatpants.pdf
    • http://sunipemumax.66ghz.com/99220153615.pdf
    • https://cdn.sqhk.co/raxuzuvuluf/iehdhb7/pofobixopo.pdf
    • https://cdn.sqhk.co/koxixoneto/Gicjhjd/xovaforir.pdf
    • https://cdn.sqhk.co/bulixanejad/pGXgdic/58882224876.pdf
    • https://vufobuvi.weebly.com/uploads/1/3/1/1/131163959/0b5fc6c.pdf
    • https://burakatotofok.weebly.com/uploads/1/3/1/8/131871829/wokajewezetom_digisot_kesalamusuf.pdf
    • https://cdn.sqhk.co/tumexifukevu/hegcV11/game_hungry_shark_mod_apk_revdl.pdf
    • https://cdn.sqhk.co/wikomawile/fhbiejb/formal_email_to_professor_asking_for_help.pdf
    • https://cdn.sqhk.co/nawamuzimosu/p4j0WQK/64306623239.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://javamav.rf.gd/3d_photo_depth_map_photoshop.pdf
    • https://uploads.strikinglycdn.com/files/ee0a1b1d-4c7f-4f9d-bf23-cadff2da627d/best_feats_for_a_tempest_cleric.pdf
    • http://suredutika.rf.gd/lodawa.pdf
    • http://wumoxafu.epizy.com/wumodonunaraturozuwagegu.pdf
    • https://uploads.strikinglycdn.com/files/aebcea67-7d19-497a-a1a7-dc88bb791c56/wofolug.pdf
    • https://uploads.strikinglycdn.com/files/45731097-5103-4306-93b7-e75875bcd74d/toxig.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_off0000d241.bin
90ad5f10bea481495c750a546fb87ba7fa86b59d87d4ef6ff4c2e709cc22a3f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD241 5536 bytes
font_01_sfnt_off0000e4e7.bin
26ae87b5417aee5acd866e6727391f397079efab3635512e767a7fdfe2ce88cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E7 2220 bytes
font_02_sfnt_off0000eed4.bin
d899f5ece58d078d2e4dcf451ebd4e35cc07c894e43e2781ab6e4ab8b1a6c274		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEED4 10904 bytes

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