Malicious PDF — malware analysis report

Static analysis result for SHA-256 8798b7431cd64ae5…

MALICIOUS

PDF

79.1 KB Created: 2021-05-14 02:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8cf6f90f873934f165d4a1526c3d5f22 SHA-1: 27d59ab33d62e5bf9084ff13b5b6ed90859c5be8 SHA-256: 8798b7431cd64ae501646e922e96b95c4901b724131a79aacddbc32cd6037ca9
244 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to disposable hosting, and one critical link to a known malicious redirector. This indicates a likely phishing or SEO spam campaign designed to drive traffic to malicious sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://dafemum.ru/strik?utm_term=what+is+step+4+in+aa In PDF document text
    • http://wolifote.getenjoyment.net/xisexejazoloxez.pdfIn PDF document text
    • https://kabuvegezukab.weebly.com/uploads/1/3/5/3/135325093/govuruperuvuxawuf.pdfIn PDF document text
    • https://cdn.sqhk.co/vapezuwe/X2hh94T/wuxoposu.pdfIn PDF document text
    • https://mogatuzutixu.weebly.com/uploads/1/3/4/6/134684840/535946.pdfIn PDF document text
    • https://bezamefiparafu.weebly.com/uploads/1/3/4/6/134665790/kozikode.pdfIn PDF document text
    • https://cdn.sqhk.co/konidadelan/jjgegjr/bexuxujove.pdfIn PDF document text
    • https://xefakebeka.weebly.com/uploads/1/3/5/9/135993821/6319d7aa605f0.pdfIn PDF document text
    • https://lupuxamugegudi.weebly.com/uploads/1/3/4/6/134623484/9911150.pdfIn PDF document text
    • https://senemoribut.weebly.com/uploads/1/3/4/7/134703027/fatafirulizepan.pdfIn PDF document text
    • https://cdn.sqhk.co/vekasurox/PiiDfjb/15467011806.pdfIn PDF document text
    • http://modozadubop.mywebcommunity.org/mazixafunoze.pdfIn PDF document text
    • http://safagiko.iblogger.org/sasaj.pdfIn PDF document text
    • https://borikalubir.weebly.com/uploads/1/3/2/6/132681749/2442345.pdfIn PDF document text
    • https://pidoruna.weebly.com/uploads/1/3/5/9/135966994/1215d47d9463.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/jhjeHge/mario_kart_tour_event.pdfIn PDF document text
    • http://pobadabodoz.scienceontheweb.net/nanostructures_and_nanomaterials_cao.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://559ef5b4-38f4-491c-95f5-a6f57f0534fb.filesusr.com/ugd/1b862a_c757720663dc44b4b88c2b19056571d8.pdf?index=trueIn PDF document text
    • http://fidegaf.atwebpages.com/bus_190_nj_transit.pdfIn PDF document text
    • http://kagexukus.rf.gd/appendicectomie_par_laparotomie.pdfIn PDF document text
    • http://diwavese.rf.gd/53302458794.pdfIn PDF document text
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_2e915311901a42d0bb4bc35f6acb2378.pdf?index=trueIn PDF document text
    • http://dupikupujetilu.rf.gd/1630560763.pdfIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_c8cf2a3fb105481cb1247674a93ff422.pdf?index=trueIn PDF document text
    • http://kuzibawo.rf.gd/will_microsoft_flight_simulator_2020_be_on_xbox_game_pass.pdfIn PDF document text
    • https://3c3b6f52-20a2-448a-be11-eec5930c502f.filesusr.com/ugd/0ca786_507128da21a8483489c91f572e3d5ac6.pdf?index=trueIn PDF document text
    • http://rukosivujuxu.atwebpages.com/31660790000.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_off0000fa35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA35 4880 bytes
SHA-256: f459fe93e321df3e49f48697b1b392b01afff5a3fd3ebfaac0041ca35e8c92b5
font_01_sfnt_off00010ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE4 10436 bytes
SHA-256: 7ab0563a68767b2c110435594291fee2788166d5d92a1408b7c826a1a4671499

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