Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c42b50f8750cb5…

MALICIOUS

PDF

77.9 KB Created: 2021-04-17 21:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b373ba404d26e87f13ae22afbb8149f1 SHA-1: b7d955a18c3212bb7dbc22090a300471b2e88e47 SHA-256: a7c42b50f8750cb5bc3fbcacfea65456e1798f06583fbed2e807363376011fba
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identified it as a link farm. One prominent URL, 'https://midufefew.ru/strik?utm_term=american+red+cross+cpr+renewal', suggests a phishing lure related to CPR renewal. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://midufefew.ru/strik?utm_term=american+red+cross+cpr+renewal PDF link annotation
    • http://wiwajekirutiw.scienceontheweb.net/38705920340.pdfIn PDF document text
    • http://jamotovoxut.mywebcommunity.org/80026932298.pdfIn PDF document text
    • https://cdn.sqhk.co/kagumuzom/pnFjiha/xepitozej.pdfIn PDF document text
    • http://rituralajozeli.iblogger.org/lagupiwemaxuxojudorivodok.pdfIn PDF document text
    • https://cdn.sqhk.co/wepugozotap/aiigUhj/7670114483.pdfIn PDF document text
    • http://copyright-notice-ig.com/cmo_construir_una_gra_prtico_de_m5vwlq.pdfIn PDF document text
    • https://cdn.sqhk.co/zumiredosuwi/jacDnif/duveriboravokijore.pdfIn PDF document text
    • http://esclick.pro/the_iron_king_maurice_druon_read_online2q9er.pdfIn PDF document text
    • http://gojumoxalofeloj.iblogger.org/small_engine_carburetor_tuning.pdfIn PDF document text
    • https://cdn.sqhk.co/rorezina/jgginhc/klondike_adventures_unlimited_energy.pdfIn PDF document text
    • https://cdn.sqhk.co/pobumepova/nhajBfq/directv_hd_channels_numbers.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/d572e74f-b0ce-4e0a-8b20-adc496429d4b/moxiserux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a839a4b-0005-4094-a6e8-01368d294a41/18237830424.pdfIn PDF document text
    • http://kulilemol.epizy.com/88317740137.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93a43b89-fc31-439f-8e03-98ef821fc534/simplehuman_automatic_soap_dispenser_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75cb5158-2faa-46b0-beae-40aab77344c3/79551305787.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb5684a3-e4a7-4ac7-bf17-fa879ffdee8a/46767410912.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4493def9-de66-4809-bc07-529a3c8a7288/how_to_connect_ilive_speakers_to_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39eb5865-bbfb-4f1e-901c-b3be5eadf64e/ziriwuzegugap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3be028db-7b15-4365-8520-bed4fef780d7/what_is_a_purchase_allowance.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_off0000f313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF313 5300 bytes
SHA-256: 75e8997a52abd5a8c92f8e46d35b652f7897d3ef9a76aae60acd3c0afb9d81d1
font_01_sfnt_off00010513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10513 10988 bytes
SHA-256: c3ba5fefa11b6432912ed7ed3bbc83ae1336488ed9eabd7547d21d379e4e89a7

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