Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf0b496b1fb2e1a…

MALICIOUS

PDF

73.2 KB Created: 2021-02-27 17:58:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4dcbf132b0a9efc53a9358129e272c65 SHA-1: 74d66d08de65a143a206c0bd6bcd7d4a1311fc5c SHA-256: acf0b496b1fb2e1a521650a796c074d68a34f69c06c034477303d3e9f7dcc7a5
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful sites. The embedded URL 'https://resalured.ru/wix?keyword=the+sims+freeplay+offline+mod+apk' indicates a lure for software downloads, a common tactic for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/wix?keyword=the+sims+freeplay+offline+mod+apk PDF link annotation
    • https://cdn.sqhk.co/mowasikuso/cibvjbO/civilization_v_border_expansion.pdfIn PDF document text
    • https://rafowatixi.weebly.com/uploads/1/3/0/8/130874563/kefixajal.pdfIn PDF document text
    • http://mowefopovog.mywebcommunity.org/how_to_use_ipad_as_writing_tablet_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/doporaba/fjigejf/nra_lobbying_money_spent.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/fhiifjj/frozen_cod_fillets_recipe_easy.pdfIn PDF document text
    • http://jiwapadenejeza.getenjoyment.net/the_ravenous_pig_brunch_menu.pdfIn PDF document text
    • https://cdn.sqhk.co/kadeposamo/8hfhSP7/kujapitijafije.pdfIn PDF document text
    • https://cdn.sqhk.co/vusutesilo/CgfEMgi/quick_home_switcher_apk.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/49245540768.pdfIn PDF document text
    • http://pinegobojefo.getenjoyment.net/kafevubojukit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fopalew/whirlpool_refrigerator_reset_water_filter_indicator.pdfIn PDF document text
    • http://jimatisejur.rf.gd/lepuvagifavezazijofap.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/accessible_india_campaign.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/13126222075.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/94749985587.pdfIn PDF document text
    • http://xajizufobuvofo.epizy.com/expanding_sentences_worksheets_1st_grade.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_off0000e025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE025 5396 bytes
SHA-256: 830dab1fdaa541e43c6204129d88f69deabb1277b517f7c48d4a1fe26e4b6394
font_01_sfnt_off0000f259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF259 10956 bytes
SHA-256: 3f07d585b5e2365abda518930635856ddbf56eb874974b31e36ba8616a593be1

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