Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41d8293b22ee9ef…

MALICIOUS

PDF

90.8 KB Created: 2021-03-19 16:46:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: dabb07ba4595a38da3dfa715f9bfe378 SHA-1: 2d39394f1d5f71c0edd4579f97b9a7c10a242634 SHA-256: f41d8293b22ee9ef203a29d6c3375f4a8c67338a564c5a488f7ad2d935eb67c8
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting and redirectors, indicating a link farm designed for SEO manipulation or phishing. The presence of a known malicious redirector URL and ClamAV detection further supports its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dafemum.ru/strik?utm_term=how+many+covid+19+cases+in+mercer+county+wv In PDF document text
    • http://xewixejixukumes.22web.org/11612939818.pdfIn PDF document text
    • http://mativazugu.22web.org/what_research_design_is_used_in_comparative_study.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bc5ba30c-e427-49eb-abc4-9677f18f04c1.filesusr.com/ugd/bcd086_b1316ad7100c4f0bbc0a1c4a10f8faa4.pdf?index=trueIn PDF document text
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_7ab7bccf81f44cfd82e27a5477a0cebe.pdf?index=trueIn PDF document text
    • https://cdd249b8-77b1-4a94-b024-8995efe4d959.filesusr.com/ugd/d394ff_a63a91dfc37b433388b46f5d17a915cb.pdf?index=trueIn PDF document text
    • http://gajumelixidolob.epizy.com/persian_to_urdu_dictionary_free_download.pdfIn PDF document text
    • http://jidumefimu.rf.gd/busonid_caps_bula.pdfIn PDF document text
    • http://joxumokuri.epizy.com/duwemuganekitowosizazuxu.pdfIn PDF document text
    • http://julukawava.epizy.com/how_to_find_the_maturity_date_of_a_loan.pdfIn PDF document text
    • https://2d841ef3-a248-4e6a-996b-2d54d6713fdd.filesusr.com/ugd/1decf9_fd60dca9ec8b458eb8bc83d668cee20c.pdf?index=trueIn PDF document text
    • http://tedijafubivot.epizy.com/xezorekoxiwamufet.pdfIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_ddf11cd6c90447cca647f1ef184773b1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mijumomub/plural_form_of_word_abacus.pdfIn PDF document text
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_bc1d4bfc086f4016b84d34f3fafaf314.pdf?index=trueIn PDF document text
    • http://milasumumalun.epizy.com/roganunumexuz.pdfIn PDF document text
    • https://c07b3cb0-7d4a-4e65-9c62-eb3bd0ce3b6b.filesusr.com/ugd/7560d5_6ca4422ada1a4ad592d4c17db57b4c70.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/como_bloquear_una_pagina_web_android.pdfIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_82194e4d6f2f4922a16fd4be442c3234.pdf?index=trueIn PDF document text
    • http://lutilusomufele.epizy.com/command_line_arguments_in_c.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/rawumano.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/gta_san_andreas_cheats_mobile_apk.pdfIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_98be1cd13eba4d96b419c851efb604c4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/deckers_co_weather_report.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_off00012150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12150 5476 bytes
SHA-256: 016820a845836f367ea91f5cc39677edbba82d37310290208dc04653b4eab649
font_01_sfnt_off000133f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F4 12588 bytes
SHA-256: aee91c2380cf64ebd81264c18017b4415b63bdd924b0eb5a41ea331f6867076e

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