Malicious PDF — malware analysis report

Static analysis result for SHA-256 794ddcdde59df25e…

MALICIOUS

PDF

80.4 KB Created: 2021-04-27 01:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 4a96f3b3089dea9b230060d3852f5a2c SHA-1: 53f83cf0273a610e54fe29e2430779380530634c SHA-256: 794ddcdde59df25e628a63a0aee62727731029c7b19f55f47492766e466bb298
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it is likely a phishing or malware distribution document. It contains numerous external URIs and embedded links, many pointing to disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to learning organic chemistry, likely a lure to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ponafet.ru/strik?utm_term=how+to+learn+basic+organic+chemistry PDF link annotation
    • http://remont-kholodilnikov.website/poboy_express_menu_hattiesburg_ms8n6il.pdfIn PDF document text
    • http://xigesoti.iblogger.org/wills_eye_hospital_location.pdfIn PDF document text
    • http://verezitabel.66ghz.com/2018_lexus_rx_350_cargo_capacity.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477386/normal_600930e451dc0.pdfIn PDF document text
    • http://vezdesami.ru/php_rest_client_libraryp3srx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427783/normal_5fde810b24923.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496816/normal_601c790d9112e.pdfIn PDF document text
    • http://defi-bet.world/compare_3nf_and_bcnf_in_rdbmskfo31.pdfIn PDF document text
    • http://microdigitalmeter.xyz/kananiledupapigb9ul.pdfIn PDF document text
    • https://cdn.sqhk.co/wugolekufo/6hbOiga/53814781916.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495400/normal_604cf7b87a1ae.pdfIn PDF document text
    • https://cdn.sqhk.co/gefisodir/hCe9Gem/jamawinejapasedizivo.pdfIn PDF document text
    • https://cdn.sqhk.co/vatomepipiw/0hgjggd/rock_climbing_gym_tucson_az.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377113/normal_5fc6df0c313e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451766/normal_5fe6d9c62b6f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419637/normal_5fc87f499820e.pdfIn PDF document text
    • http://hopecommunitynaz.com/understanding_the_borderline_mother_typeslpki8.pdfIn PDF document text
    • https://cdn.sqhk.co/wifinalimow/idimkaS/kipedojowewenekubo.pdfIn PDF document text
    • http://xajoraxi.22web.org/arduino_language_char.pdfIn PDF document text
    • https://cdn.sqhk.co/goronikel/LkHijha/commuter_rail_boston_to_providence_cost.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sawisanomo.epizy.com/45947426121.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5097d3ce-86a2-45e0-95c7-4f757e34141f/penem.pdfIn PDF document text
    • http://bipaxoxibiva.rf.gd/squeeze_momentum_indicator_mt4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bc57d78-68c2-46cd-ae0f-62ba8bf24b1e/what_are_contingency_tables.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b0c94d4-4c6c-4ecc-9138-618072479c14/how_much_does_a_german_shepherd_pitbull_mix_weight.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_off0000fb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4E 5508 bytes
SHA-256: 28a71a078b53561793d5293516e5100bee18668e73d2f3d38f10fa5678cd248b
font_01_sfnt_off00010df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF3 11096 bytes
SHA-256: 327eb7b4958e0f953c082e05ffe729d2ea7b6cfd3982790deff875227fe6a16a