Malicious PDF — malware analysis report

Static analysis result for SHA-256 4422f6faaba1c7b7…

MALICIOUS

PDF

77.3 KB Created: 2021-04-29 03:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: a2d701b620e550d9d07381878dc1a603 SHA-1: ece0b3e40317def7e2f6717d1ec6b82f5dc64f7b SHA-256: 4422f6faaba1c7b722b4554cfb75086edcf886ae184c368565f7ef4782651891
244 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, containing numerous embedded URLs that direct users to external sites, one of which is a known malicious redirector. The presence of many links on disposable hosting further suggests malicious intent, likely to distribute further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://yafferge.ru/strik?utm_term=can+you+mix+yogurt+and+juice+in+a+smoothie In PDF document text
    • https://zalorapowil.weebly.com/uploads/1/3/1/8/131871687/foxagadimopetovonen.pdfIn PDF document text
    • https://rawiranuxox.weebly.com/uploads/1/3/4/6/134618620/bawasanaxixuje.pdfIn PDF document text
    • https://berisojelo.weebly.com/uploads/1/3/0/8/130874511/4127434.pdfIn PDF document text
    • https://tufelonidozuwux.weebly.com/uploads/1/3/2/6/132681512/fokewexupaki.pdfIn PDF document text
    • https://godivibodo.weebly.com/uploads/1/3/4/0/134040440/jaxeselumimelu.pdfIn PDF document text
    • http://rilomenininun.getenjoyment.net/what_is_a_99_year_lease.pdfIn PDF document text
    • https://fapudajom.weebly.com/uploads/1/3/2/6/132681453/716945fe4.pdfIn PDF document text
    • https://janirakuvofubej.weebly.com/uploads/1/3/4/7/134734148/8341325.pdfIn PDF document text
    • http://fofiwafajelerax.sportsontheweb.net/entrepreneurship_education_model.pdfIn PDF document text
    • https://fosubenasodu.weebly.com/uploads/1/3/4/0/134097760/jenowixebep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_aa35822b2a4148d7ac55230c19716ac5.pdf?index=trueIn PDF document text
    • https://770cee9b-59ea-4c2b-ae8d-aad83b0abb79.filesusr.com/ugd/8b25c7_2a118d5a308b45daa8d83eaf8c1bf886.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6917411-132b-470c-8380-0a60e5da0fc3/law_of_success_book_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c688551d-911b-40ce-b553-ccfbabcd2bec/86267611764.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d8f5774-aea7-4bba-bdc4-7561cd2b1558/gudefabamugititakelaxitu.pdfIn PDF document text
    • http://dejogamolefip.rf.gd/65481977550.pdfIn PDF document text
    • http://kaxoxosav.rf.gd/torosopufofupivir.pdfIn PDF document text
    • https://f84ffea9-2755-49c2-9cb5-47ca8b55fe65.filesusr.com/ugd/0adedf_25fc375f1b2e402ab1d6286d73004623.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/da3d37e5-a296-4cb1-a2d6-c9b13d437228/87010858594.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_off0000ede8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE8 5472 bytes
SHA-256: 4b3d2413ddc6bdc75272a4bdfbd22d687adb470401b13644d05eda6299cd466b
font_01_sfnt_off0001006a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006A 11756 bytes
SHA-256: ac355162f9ebf925007d76c130bf49777765d175d85947986ba98b9d21ffff77