Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1506d903e58eced…

MALICIOUS

PDF

78.3 KB Created: 2021-03-12 09:03:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d6c2bd1f477369a41de07ab19be8ed60 SHA-1: df19efb5bc79e2d70216e17c8a60a271795dc596 SHA-256: b1506d903e58ecedfd21d8f7be91a086c8313f68fa1eb5de3d0166326deeb5a7
186 Risk Score

Malware Insights

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

This PDF file is classified as malicious due to its structure and embedded URLs, which are indicative of a link farm or SEO spam campaign. The document contains numerous external links, many hosted on disposable domains, designed to redirect users to other sites. While no scripts were explicitly extracted, the PDF's nature and the presence of external links suggest it's part of a phishing or traffic-generation scheme.

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
  • 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://baarspo.ru/award?keyword=basic+english+grammar+pdf+book PDF link annotation
    • http://xunidar.iblogger.org/vuvibadirivevutupesibum.pdfIn PDF document text
    • http://nurigoluda.mygamesonline.org/jubajoxinidasawebekokiw.pdfIn PDF document text
    • http://dasiwujupuna.sportsontheweb.net/barcelona_bus_turistic_map.pdfIn PDF document text
    • http://anarchymedya.com/65010462742gj4ea.pdfIn PDF document text
    • http://ductsunlimitedins.com/zivibuzohx4e.pdfIn PDF document text
    • http://navalny.design/kilofelimaluzifapimai3u3.pdfIn PDF document text
    • http://waferaboteb.mypressonline.com/kopaseviliwumi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nabotiwufonego.epizy.com/nujepoxagezagatazakawapa.pdfIn PDF document text
    • http://dawozisi.rf.gd/75467064517.pdfIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_f40d006e699b4b79ac75295fbe1017cb.pdf?index=trueIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_4b6d26415bf747f8a74e5c1c5db985c2.pdf?index=trueIn PDF document text
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_389974ae90054d4f9b3f847b8f0d62bf.pdf?index=trueIn PDF document text
    • http://tibarokavuvuri.epizy.com/anti_deep_freeze_v8.pdfIn PDF document text
    • https://476bd0ee-6fcc-4883-9008-ab3df93dc9e0.filesusr.com/ugd/cac9e4_f78ed66829cf41c486e48aded1f66cfb.pdf?index=trueIn PDF document text
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_c933467497d84a0392904e4ee52342a2.pdf?index=trueIn PDF document text
    • http://xowobovu.myartsonline.com/65400567122.pdfIn PDF document text
    • http://mugazukadum.onlinewebshop.net/how_to_set_intex_saltwater_pump.pdfIn PDF document text
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_5f01d2ed2b754185b24dae1ef1a35b90.pdf?index=trueIn 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_off0000f235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF235 5820 bytes
SHA-256: cdf2dd06c1be33582f310a71bccefdad748dd7e3396f6221ff42466e577d90ea
font_01_sfnt_off000105d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D7 10740 bytes
SHA-256: 1a51dd8912d41a8e2bc43e1e491d591105caefbdf1c40829ca1bea6d1d029f49

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