Malicious PDF — malware analysis report

Static analysis result for SHA-256 8245b09568514615…

MALICIOUS

PDF

72.7 KB Created: 2021-03-29 05:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0723c908e13b0781b08ca44562d080c1 SHA-1: 503b34d409cc94f597da9bdf1065e5919e395500 SHA-256: 8245b0956851461595bba5b2e15256af07d41dde3bba0372df68df08822ec81e
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of external links, suggesting it functions as a link farm, potentially for SEO manipulation or to host phishing content. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://cdn.sqhk.co/kawiwitifa/hghOjjZ/38883413247.pdf In PDF document text
    • https://cdn.sqhk.co/pugudanirav/biiFjax/netflix_price_monthly_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/kowaziwaso/hgLr9hh/striper_fish_lures.pdfIn PDF document text
    • http://discovljzg.fun/33828171832u6rd4.pdfIn PDF document text
    • http://dubiniba.iblogger.org/best_animation_app_for_android_2019.pdfIn PDF document text
    • http://1offpark.xyz/hillsborough_county_public_schools_hoursm605g.pdfIn PDF document text
    • https://pukizorot.weebly.com/uploads/1/3/1/3/131384201/pogewet.pdfIn PDF document text
    • https://mozozorez.weebly.com/uploads/1/3/5/3/135343695/xakepujovitedi.pdfIn PDF document text
    • https://vatatolomaz.weebly.com/uploads/1/3/4/4/134495066/84f9b3853ef976.pdfIn PDF document text
    • https://cdn.sqhk.co/zosurinipin/hbFidf5/san_andreas_mod_installer_for_pc.pdfIn PDF document text
    • http://lafarupikawa.22web.org/because_or_because_of.pdfIn PDF document text
    • https://cdn.sqhk.co/jozojijejip/RQ7TcKe/42330488961.pdfIn PDF document text
    • http://organic100.fun/percy_jackson_and_the_lightning_thief_graphic_novel_epubh5trv.pdfIn PDF document text
    • http://kartaidatodemeleri.com/904682060910obi4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/bVCGPfG74RQ/wb?keyword=how%20to%20change%20wifi%20password%20on%20hp%20laserjet%20printerPDF link annotation
    • http://tepuxasimu.rf.gd/old_school_cars_for_sale_in_michigan.pdfIn PDF document text
    • https://d5f1d3db-1598-48d0-a061-764c190a6564.filesusr.com/ugd/866690_e5e39db2b32042c2ae8f8a5ed37afcfb.pdf?index=trueIn PDF document text
    • https://f72e0e13-a873-49c5-9cb5-3c2848b8c5b2.filesusr.com/ugd/f8ba4b_818c94860860411a874198d8cfa73912.pdf?index=trueIn PDF document text
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_829d96d5a0504a4c8952529ebe962152.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2469ae05-a442-44be-9d1a-dba6aa2bbe14/jotiwiloxu.pdfIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_a0931a9793b04d578fbe65f091ac5b80.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5b356c1-36f5-49fb-a507-9a2be5150951/gigaweba.pdfIn PDF document text
    • http://xekujigifur.epizy.com/irregular_verb_with_past_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2792ebcd-f3b5-425d-8655-d181f90bab4c/48673161213.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d2f2b49-5fdc-4a06-bd56-7204a2a0b194/pogajumaziwirifu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA8 5548 bytes
SHA-256: a28d741572acb111c1069ae2728073d1310feb6dbac599d45b4e6afdf6fa1073
font_01_sfnt_off0000ef99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF99 10960 bytes
SHA-256: 59865d867f8e714f713af9a0075c3e02403db499b29f7f491c3c4b4af1ac1fdd