Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b26463039e02d25…

MALICIOUS

PDF

77.2 KB Created: 2021-04-11 11:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5d484f247ecff2801f4f7c69b9058dfc SHA-1: 15082fdb97dbc59b66fb57446691c4c7a70d8a44 SHA-256: 0b26463039e02d25a0f1a94d1065459cb339bafbfe1b44decea4436db2cf45f7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://zajinet.ru/strik?utm_term=what+is+a+social+research+job PDF link annotation
    • https://wiguvebilef.weebly.com/uploads/1/3/5/3/135389097/pidofusezuvem.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/CpXjdij/pafexupipilesisatumi.pdfIn PDF document text
    • https://zejenabo.weebly.com/uploads/1/3/0/9/130969472/229fb27e05.pdfIn PDF document text
    • http://mumezofenina.22web.org/functional_analysis_and_allocation.pdfIn PDF document text
    • https://vapiwoke.weebly.com/uploads/1/3/4/3/134338270/fofeduxapatarokaxet.pdfIn PDF document text
    • http://sakazopipabuw.22web.org/milep.pdfIn PDF document text
    • https://cdn.sqhk.co/jefapukawore/iie7AKF/47879407697.pdfIn PDF document text
    • https://cdn.sqhk.co/fovuxugo/jihchbY/zubumalux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcb52c48-0be4-4ecc-96d9-1f229f0c2207/jowuwurowa.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/piniri.pdfIn PDF document text
    • http://fufibilola.epizy.com/honda_fit_2016_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61694679-f979-49db-bfdc-999f3f771a89/dr_brown_bottle_warmer_and_sterilizer_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/valupoleziduxuxunolik.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/do_pawn_shops_give_payday_loans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a700287-0184-4ce5-80d5-dbb4b256a216/undoing_the_demos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63822e36-0cc7-462a-9da1-dbf30e666487/what_to_do_when_the_dishwasher_wont_clean.pdfIn PDF document text
    • http://pikexiwa.epizy.com/pofofikupetadijopigus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a34e5b01-4687-4a47-8bee-9b3d7ae4599b/bella_titanium_waffle_maker_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/827d4d32-ca98-4d24-99e4-d33a2010780d/nopalalotujusi.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/little_prince_1974_full_movie.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_off0000f02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02F 5116 bytes
SHA-256: 52a9fa8a7f0709f5d38af55514371b257d13a6942b07162014a097ddab19512b
font_01_sfnt_off0001019c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019C 11384 bytes
SHA-256: d7156372df3004efc5bef99cd36ea859d1d307a34a6cfed7d6b41abcfb1cafdc

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