Malicious PDF — malware analysis report

Static analysis result for SHA-256 7980cefc3cc5d41b…

MALICIOUS

PDF

77.5 KB Created: 2021-04-04 19:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4e59b6d108358ed868e92d491392ec68 SHA-1: aa019338177faece9c82cbba510f69aa49448650 SHA-256: 7980cefc3cc5d41b5fb4b4c2519a9708c7424916ee1381570d50fabd184204f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://mezovuduw.ru/strik?utm_term=gregor+the+overlander+chapter+9+summary PDF link annotation
    • http://fudoviwil.mywebcommunity.org/ruveru.pdfIn PDF document text
    • https://cdn.sqhk.co/wawerugile/dfChjhj/child_care_tax_credit_form_14.pdfIn PDF document text
    • https://cdn.sqhk.co/migefareg/YhhhhKj/geometry_dash_2._2_download_windows_10.pdfIn PDF document text
    • http://tugokutuli.scienceontheweb.net/vemononifejoxasuz.pdfIn PDF document text
    • https://cdn.sqhk.co/noviraxat/gKhdfjc/botumojoguxamejudirajowar.pdfIn PDF document text
    • https://cdn.sqhk.co/keserina/gjoAgds/live_streaming_fox_news_free.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/ggjPSBh/bifalinotut.pdfIn PDF document text
    • http://mkuu.club/92200860089qneor.pdfIn PDF document text
    • http://bajifepeselok.sportsontheweb.net/lomemepel.pdfIn PDF document text
    • http://zutolewe.mywebcommunity.org/hamstring_tear_rehab_protocol.pdfIn PDF document text
    • http://fitokaps.xyz/gilavukaxefafipukumnwlce.pdfIn PDF document text
    • https://cdn.sqhk.co/febowozefu/iihi52g/device_care_app.pdfIn PDF document text
    • http://sagedix.medianewsonline.com/aquastop_nanoflex.pdfIn PDF document text
    • https://cdn.sqhk.co/wexufenu/7bnuFLL/reliance_jio_recharge_online_paytm.pdfIn PDF document text
    • https://cdn.sqhk.co/rarukaboz/RLjhXF6/kikim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://turitize.rf.gd/what_channel_is_peoples_choice_awards_on_spectrum.pdfIn PDF document text
    • http://povalimokuwov.rf.gd/buxove.pdfIn PDF document text
    • http://busixojap.epizy.com/agnus_dei_chords_key_of_a.pdfIn PDF document text
    • http://pabizex.atwebpages.com/ruledikuron.pdfIn PDF document text
    • http://pevipitoz.atwebpages.com/71690993454.pdfIn PDF document text
    • http://pasalalu.rf.gd/piniruxuligeze.pdfIn PDF document text
    • http://rugoxesoteko.myartsonline.com/adjectives_describing_places_worksheet.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_off0000ef84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF84 5836 bytes
SHA-256: c3a40adc877d4123f2263834b5f146bc15e498d9e57f3a72269814c81afc2ec1
font_01_sfnt_off0001034b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034B 10916 bytes
SHA-256: 9a4a95304f3e2bce27c88a216116924d105343de84a0d388d6faf183d56d60c8

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