Malicious PDF — malware analysis report

Static analysis result for SHA-256 843e0fbece0d96ed…

MALICIOUS

PDF

93.5 KB Created: 2021-02-21 09:25:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b75c4b157eaa13a8c832f8c00d81c1b3 SHA-1: 6880ec7f2ec6918bd07d0ae8b1e5169cd0a9c12e SHA-256: 843e0fbece0d96ed7e158624dfb7f9e4ece8e7422477c7931d05d0d12201a553
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting services, characteristic of a link farm. One critical heuristic identified a link to a known malicious redirector, and ClamAV detected the file as a phishing trojan. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of numerous external links suggests an attempt to lure users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/wix?keyword=humax+tivo+series+2+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379736/normal_60111a91210cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369671/normal_602c885c78ecf.pdfIn PDF document text
    • https://cdn.sqhk.co/mozoposowi/eheHShb/50907586069.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/jFgg0m7/goodreads_app_free.pdfIn PDF document text
    • https://cdn.sqhk.co/govamopega/jxj5ggg/xufefezomodu.pdfIn PDF document text
    • https://cdn.sqhk.co/ramosigobis/ij3lYhb/tubuwonusekekixariroraf.pdfIn PDF document text
    • https://kigumafu.weebly.com/uploads/1/3/4/1/134131380/foxezegisuxe-lovize-zejezag-vebafagip.pdfIn PDF document text
    • https://gefererasixo.weebly.com/uploads/1/3/4/7/134749514/70af6c98.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373301/normal_5ff3129151ef9.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/ihiajb6/23825352756.pdfIn PDF document text
    • https://cdn.sqhk.co/gebitasixa/ikjhgt6/idle_mafia_tycoon_manager_mod_apk_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366406/normal_601f52de740cd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://girupesoja.rf.gd/22226015825.pdfIn PDF document text
    • http://lodusebivepakef.epizy.com/pulenazajiwutufagoti.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/piriformis_anterior_pelvic_tilt.pdfIn PDF document text
    • http://valebuwevunav.epizy.com/kali_linux_hacking_tools_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/nach_baliye_song_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/jamupar.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A57 4932 bytes
SHA-256: f73904411e93ee630e87d692ce523b837b9474c5fcf438927b55ab2ef25355ce
font_01_sfnt_off00012b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B02 14980 bytes
SHA-256: e9eff70a68bc3554cf467137e3eafbdedd1b40abb7f6c46d12d9924f2f6594ae
font_02_sfnt_off00015a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A69 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361