Malicious PDF — malware analysis report

Static analysis result for SHA-256 c15ef2db6a2be2da…

MALICIOUS

PDF

75.2 KB Created: 2021-03-29 20:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce0b7ea26be2052ded7125b9de777ef6 SHA-1: ebe60e01a22d2f24d3a821a4e90b121ce298de7b SHA-256: c15ef2db6a2be2daca8d080690dff8554201af5926a06ef93e73808c8e4ab333
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing operation. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or malware distribution vector. The primary IOCs are the numerous external URLs embedded within the document.

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://zajinet.ru/strik?utm_term=calligraphy+free+ebook+download+reddit
    • https://cdn-cms.f-static.net/uploads/4421476/normal_60207f2c9d259.pdf
    • http://wodekenizowa.getenjoyment.net/jedolizogimixabo.pdf
    • https://cdn-cms.f-static.net/uploads/4417429/normal_601e57645a23a.pdf
    • https://cdn.sqhk.co/pesasotiro/ZvghUje/sugar_skull_wallpaper_border.pdf
    • https://latolupolazu.weebly.com/uploads/1/3/4/0/134017494/5705587.pdf
    • https://cdn-cms.f-static.net/uploads/4467593/normal_60397a27ee1ef.pdf
    • https://cdn.sqhk.co/serodozire/ie8Bsja/fiberukewibe.pdf
    • https://static.s123-cdn-static.com/uploads/4374954/normal_6001027a1edcd.pdf
    • https://joxedobiwot.weebly.com/uploads/1/3/5/3/135350216/8268966.pdf
    • http://kadanijojabuf.mywebcommunity.org/t_fal_actifry_stopped_working.pdf
    • http://fizarumokugafu.mywebcommunity.org/virology_textbook_download.pdf
    • https://cdn-cms.f-static.net/uploads/4417530/normal_6022e6d182812.pdf
    • http://dobofozepop.mygamesonline.org/gumurutixotevufodivew.pdf
    • https://japarikadag.weebly.com/uploads/1/3/4/1/134108792/0cbfe6d488.pdf
    • https://static.s123-cdn-static.com/uploads/4411931/normal_5fe45c30b3125.pdf
    • https://ramasiwo.weebly.com/uploads/1/3/5/3/135390431/bifomakefipelat.pdf
    • https://cdn.sqhk.co/wiwokosokif/brAHggg/92279441721.pdf
    • https://cdn-cms.f-static.net/uploads/4501029/normal_6049079f92b07.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kepagewav.atwebpages.com/xovabasawopevisu.pdf
    • http://vidugozu.atwebpages.com/50499826711.pdf
    • http://naxesabefadufu.atwebpages.com/49841987346.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_off0000e68b.bin
1eafba508286bdee35c312db6f04e9859e4a9f4c6e3edc6f666f84d8be8c1daf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE68B 5428 bytes
font_01_sfnt_off0000f90f.bin
a515120433c79e40373c34c8c0d40ec4256fcaba997dd858ae326f745a192668		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF90F 10744 bytes

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