Malicious PDF — malware analysis report

Static analysis result for SHA-256 2020a8378f2aff96…

MALICIOUS

PDF

80.6 KB Created: 2021-03-04 23:18:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cf624948dc3cdb5c39a5e72767b318cb SHA-1: 2774da8c816528f1382259e4b307cec925a0b784 SHA-256: 2020a8378f2aff9600f1ad580e794844e5cdff8594fbd4e6e937a796f68fe155
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a network of links on potentially malicious or spammy hosting. The presence of external URIs suggests the document is designed to redirect users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jacksth.ru/award?keyword=cvs+warm+steam+vaporizer+manual PDF link annotation
    • http://zikewexer.scienceontheweb.net/mowudonuvivesus.pdfIn PDF document text
    • http://naturfresh.space/984099260264j8xp.pdfIn PDF document text
    • https://cdn.sqhk.co/nubenirosife/cx7mjfW/color_by_number_coloring_book_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496378/normal_5fcd58403f4ca.pdfIn PDF document text
    • http://daating19.site/injection_blow_moldingehua3.pdfIn PDF document text
    • https://cdn.sqhk.co/numovasovev/jjInih9/racing_center_warsaw_pozar.pdfIn PDF document text
    • http://fesalasan.mygamesonline.org/jivadapukabusoxima.pdfIn PDF document text
    • http://info-pages.ru/stihl_weed_eater_string_wont_feedhbwx0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366004/normal_6007b8b806da6.pdfIn PDF document text
    • http://faceit.su/rojatinomu25ct5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://netojisabozop.rf.gd/2018_animated_movies_free.pdfIn PDF document text
    • http://tomokod.rf.gd/saraswati_puja_puspanjali_mantra_in_bengali.pdfIn PDF document text
    • http://fuguzametekobo.myartsonline.com/a_dolls_house_movie_script.pdfIn PDF document text
    • http://nakepusigazu.epizy.com/8137101246.pdfIn PDF document text
    • http://rovarede.rf.gd/vozibazabojipu.pdfIn PDF document text
    • http://delozaroj.epizy.com/reset_neato_d7.pdfIn PDF document text
    • http://xuzezomitan.rf.gd/vonixazizigebowimasud.pdfIn PDF document text
    • http://bubomikofar.epizy.com/2526940010.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_off0000f48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48E 5072 bytes
SHA-256: ba7aebe03d5f24983cd3dd35d9463e9b804ca8af4bdf1030a4d7cb6b4e014d1b
font_01_sfnt_off000105cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CD 15452 bytes
SHA-256: f3f2946264d78d56f6a7554fc1b718144425635a91235334bad5921db78aab02

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