Malicious PDF — malware analysis report

Static analysis result for SHA-256 77dff68f8634c2a4…

MALICIOUS

PDF

75.2 KB Created: 2021-06-09 22:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6fdd9205ebe521e3ed3dddef2efbbac SHA-1: dfc728a3be6147b7287ed4aa0d7f2828ed94a4bf SHA-256: 77dff68f8634c2a4a0725b5807fb36c8896fc14b05a5d9ac780972f17e739a56
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO spamming technique. The primary URL, 'https://drafthe.ru/pbw?utm_term=area+converter+square+feet+to+meters', is presented as a utility but is likely a lure to a malicious site. ClamAV and ML classifiers confirm this is a phishing and trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/pbw?utm_term=area+converter+square+feet+to+meters
    • https://cdn-cms.f-static.net/uploads/4427293/normal_601dc85e12baa.pdf
    • https://zixotojene.weebly.com/uploads/1/3/4/3/134315054/xoligomejefuti-zuzobumupenag-tifelonelopo-kowifetimoga.pdf
    • https://cdn-cms.f-static.net/uploads/4405925/normal_6025d089b105b.pdf
    • https://cdn-cms.f-static.net/uploads/4378834/normal_60bdee7f52c2d.pdf
    • https://nokogijesa.weebly.com/uploads/1/3/1/4/131452879/jenaxavek.pdf
    • https://cdn-cms.f-static.net/uploads/4414866/normal_6056ce94b9a96.pdf
    • https://static.s123-cdn-static.com/uploads/4413017/normal_5fdfc4b9eeebe.pdf
    • https://static.s123-cdn-static.com/uploads/4365576/normal_6007d3f55433e.pdf
    • https://mejonozawus.weebly.com/uploads/1/3/4/0/134016798/kipefugilujisefefi.pdf
    • https://cdn-cms.f-static.net/uploads/4385869/normal_601576606141e.pdf
    • https://kugibunil.weebly.com/uploads/1/3/1/4/131437599/5829194.pdf
    • https://sikowegapewabi.weebly.com/uploads/1/3/5/9/135975971/7695381.pdf
    • https://cdn-cms.f-static.net/uploads/4413456/normal_600fb8819232e.pdf
    • https://dinufipaxa.weebly.com/uploads/1/3/4/4/134440308/rafuwamoz-vogawibezi.pdf
    • https://pejetoli.weebly.com/uploads/1/3/1/4/131454808/1c1ac3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://ziriwuru.pbworks.com/w/file/fetch/144565902/mapa_del_metro_cdmx_2020.pdf
    • http://lurigoluj.pbworks.com/w/file/fetch/144928551/dd_5e_character_sheet_online.pdf
    • http://tukufidanega.pbworks.com/f/lanogubolosetugaditivor.pdf
    • http://gutopevif.pbworks.com/w/file/fetch/144878268/35247582943.pdf
    • https://uploads.strikinglycdn.com/files/bb3149c8-0951-4ea2-b730-06f2f51de1b1/rapid_fat_loss_handbook.pdf
    • https://uploads.strikinglycdn.com/files/18e073c1-95f1-4da0-9206-faa84350e6a0/paxevebepapapibirakinixi.pdf
    • https://uploads.strikinglycdn.com/files/953808e6-c21e-41ff-83e5-8b14740b899b/zedarudenobudupapif.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_off0000dda2.bin
6cb52959db38634c5a2c3af29a4c876f31b28fe3f2786a37d34f55ffa6330619
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA2 5004 bytes
font_01_sfnt_off0000ee89.bin
aa368158cb6038095aa339d278b7141513213cd58ea773db911d703953e80dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE89 10096 bytes
font_02_sfnt_off00011124.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11124 4324 bytes