Malicious PDF — malware analysis report

Static analysis result for SHA-256 270f8721f31ff7fe…

MALICIOUS

PDF

70.0 KB Created: 2021-04-03 14:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8b2b321ae118564e375a43126044136 SHA-1: b1cfffd3ac6dc39e2a48a3c4de13bc0007794f9a SHA-256: 270f8721f31ff7febc917bbd8ab277f0b6126dc423311398a8abce897c051e79
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as book downloads, indicating a link farm or SEO spam tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing or malware sites. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ponafet.ru/strik?utm_term=teaching+by+principles+5th+edition+pdf+free
    • https://cdn.sqhk.co/legikowe/D6FhhU7/chapters_interactive_stories_read_online.pdf
    • https://kikebepuziji.weebly.com/uploads/1/3/0/7/130775256/1855288.pdf
    • https://cdn.sqhk.co/ferobisuw/qhbMdY7/cancionero_cristiano_gratis.pdf
    • https://cdn.sqhk.co/wobuwozavenu/hhhhfgh/82506756324.pdf
    • https://cdn.sqhk.co/fagijopi/ifzWOjh/happy_pop_bubble_shooter_magic_mod_apk.pdf
    • https://cdn.sqhk.co/dejuxafe/jg0ijRj/16154500171.pdf
    • https://cdn.sqhk.co/fovipobex/jjdgjaL/first_aid_instructional_videos.pdf
    • https://gixunilaw.weebly.com/uploads/1/3/1/8/131856646/ed7688.pdf
    • https://cdn.sqhk.co/bogulevim/gchghgh/memedroid_pro_funny_memes_2018.pdf
    • https://cdn.sqhk.co/vifejoneses/geI7Uhf/car_crash_yesterday_california.pdf
    • https://cdn.sqhk.co/lididiregi/fhdhcjc/ludo_king_mod_apk_unlimited_money_2019.pdf
    • https://cdn.sqhk.co/kizafizutuw/jhdHQia/kiss_revolutionary_french_acrylic_nails.pdf
    • https://cdn.sqhk.co/bitowiso/NoNhfhh/best_sms_app_for_business.pdf
    • https://cdn.sqhk.co/ranetixeba/7ghdeks/54934112958.pdf
    • https://puzuzabijil.weebly.com/uploads/1/3/2/8/132814257/a34f14b5fbdd.pdf
    • https://vematonejos.weebly.com/uploads/1/3/1/3/131383464/df94df789e4591.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://suvowafavij.epizy.com/esp8266mod_lolin_datasheet.pdf
    • https://44f68060-d5e3-4d58-b4e7-e3760392f352.filesusr.com/ugd/49488e_0d26e8059ca84e3ba3d05331d51ad1ac.pdf?index=true
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_b507de0a74f34d6b845092d479dddda2.pdf?index=true
    • https://1423d76f-a56f-4481-bf87-726e17039346.filesusr.com/ugd/14aee2_15d4504fbb534fec9d3f93c845671b23.pdf?index=true
    • http://kigexozuzexozo.rf.gd/93071272195.pdf
    • http://gigogapa.epizy.com/wondershare_dr._fone_toolkit.pdf
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_7f660297871944bea1581aac1281db8f.pdf?index=true
    • https://f7e05ffc-afae-4d19-be15-7e9c659e5e5f.filesusr.com/ugd/72f62b_1fefbe8d4a234a69b6a31ab6fd0e9dd6.pdf?index=true
    • 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_off0000d273.bin
cc656c7404236ba5dc100037466da56296821537030d281d2c7f1f47e9d5bc90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD273 5732 bytes
font_01_sfnt_off0000e5ed.bin
4bf7bad7890284df9d0039fbd0eaa21bce5dded473634765ac9626097bd9e473		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5ED 10588 bytes

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