Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd4a18fea407c494…

MALICIOUS

PDF

69.6 KB Created: 2021-05-05 12:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0267a5c352cadc5e114bbd551c7c7713 SHA-1: 2139aae35b6d27f3ad5c0416dace58d6b8e8c738 SHA-256: dd4a18fea407c494bb8e7ba2f0b90c1f10c0690ca7d6cba3fbda8360bd213150
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to various domains, many of which appear to be disposable hosting. The heuristic 'PDF_SEO_LINK_FARM' strongly suggests this is a link farm designed to manipulate search engine results or redirect users to malicious content. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The document body is heavily obfuscated and contains what appears to be junk data, indicating it is not intended for direct user interaction but rather as a container for malicious links.

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://nipisod.ru/strik?utm_term=drinkwell+cat+fountain+replacement+parts PDF link annotation
    • http://javefuxola.getenjoyment.net/lokogum.pdfIn PDF document text
    • https://cdn.sqhk.co/zolulesar/5hihbjh/12601883933.pdfIn PDF document text
    • https://zadukali.weebly.com/uploads/1/3/5/3/135340438/f3103bb.pdfIn PDF document text
    • https://vutajavegev.weebly.com/uploads/1/3/4/0/134040502/punijagudif_fezazoviwor_japujujosus_dirijofagavoj.pdfIn PDF document text
    • https://finubakexa.weebly.com/uploads/1/3/1/3/131383318/3443611.pdfIn PDF document text
    • https://nilanifek.weebly.com/uploads/1/3/4/4/134466172/lumok.pdfIn PDF document text
    • https://nepufetok.weebly.com/uploads/1/3/1/4/131438640/2617243.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483081/normal_5fd18fba5d79c.pdfIn PDF document text
    • http://vumonivaxozutod.mypressonline.com/agile_model_in_sdlc.pdfIn PDF document text
    • http://govitus.sportsontheweb.net/94400613673.pdfIn PDF document text
    • http://suxoxaxowigab.scienceontheweb.net/cerfa_13754_x_02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385415/normal_6011ea20d939a.pdfIn PDF document text
    • https://pinowutofabu.weebly.com/uploads/1/3/4/7/134763632/ribafinonijonur_xefanerosage_lejesikenitati.pdfIn PDF document text
    • http://fevevafo.medianewsonline.com/death_of_a_salesman_book_download.pdfIn PDF document text
    • http://xazixovabifin.medianewsonline.com/54166504970.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/87064127302.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495685/normal_5fcc21355431a.pdfIn PDF document text
    • https://wevuviwujito.weebly.com/uploads/1/3/1/6/131636984/87fc39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462985/normal_6029dfeb01e49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452588/normal_600e3adf23803.pdfIn PDF document text
    • https://cdn.sqhk.co/lagazowasobo/jjhagiS/xubodurabo.pdfIn PDF document text
    • http://niwizonoleror.mywebcommunity.org/awards_and_honours_2020_18_download.pdfIn PDF document text
    • https://cdn.sqhk.co/lukumuzu/Z03hapo/happy_watermelon_cartoon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://romakilax.myartsonline.com/grounding_techniques_for_depression.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_off0000d3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BA 5316 bytes
SHA-256: 9457a705e7725c917342de9a8da5177e2e6ac42d9f37363bc002ad86e2d837b6
font_01_sfnt_off0000e5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D9 10212 bytes
SHA-256: 87bb3dfdf2e506cdbe81766ff9e22a4cf43d83d287dfec24bb2f36e3a71a0432