Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac04cd814c47b924…

MALICIOUS

PDF

99.0 KB Created: 2021-05-01 14:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 38044c067eefac3e28f3cfaa35d8c9e9 SHA-1: 5292088b41a808d1bbe498a32bb243c49c0a5238 SHA-256: ac04cd814c47b9244256e1ea01ac43f20661f9adb54da00e7b9550a11555a014
186 Risk Score

Malware Insights

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

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 0.9994

Heuristics 6

  • 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 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://crophysi.ru/strik?utm_term=good+morning+synonyms+words PDF link annotation
    • https://cdn.sqhk.co/lebereme/janV9YC/informatica_generale_andrea_corradini.pdfIn PDF document text
    • https://cdn.sqhk.co/noxivudeva/ihhgfij/free_stock_trading_simulator_app.pdfIn PDF document text
    • https://cdn.sqhk.co/duwenaxiseve/3Tgjj1G/psycho_escape_level_5.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/1ijYHge/dc_comics_characters_names.pdfIn PDF document text
    • https://wivozodibadire.weebly.com/uploads/1/3/0/7/130775536/27cbccdba05.pdfIn PDF document text
    • https://jozeturibunoza.weebly.com/uploads/1/3/4/4/134491641/wizopujoxofej.pdfIn PDF document text
    • https://cdn.sqhk.co/puwipaneke/jiPigoP/kijogoxisutawetupaxedekuv.pdfIn PDF document text
    • https://cdn.sqhk.co/jivumigen/gjjeyDu/sazubigetokem.pdfIn PDF document text
    • https://cdn.sqhk.co/xiladuxe/jTjdugi/uptodown_tiny_little_racing_2.pdfIn PDF document text
    • https://pepuxopotu.weebly.com/uploads/1/3/5/3/135390253/9828050.pdfIn PDF document text
    • https://cdn.sqhk.co/xasurila/UjfgfHz/anorectal_malformation.pdfIn PDF document text
    • https://nefixesuxu.weebly.com/uploads/1/3/0/9/130969456/kufosa_tixew_zujutanoramamuk_wotubet.pdfIn PDF document text
    • https://netulomite.weebly.com/uploads/1/3/2/8/132814473/1846101.pdfIn PDF document text
    • https://cdn.sqhk.co/xederebat/giHjdf2/96730426363.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://subutolibi.rf.gd/computer_flight_simulator_games_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/nanostation_m2_default_admin_password.pdfIn PDF document text
    • http://zawozunilutufu.rf.gd/85552665920.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/94173408850.pdfIn PDF document text
    • https://2225f16e-b6a0-48e2-a067-d7e802b71dd4.filesusr.com/ugd/a7ada4_802ff10ca7be450f8cbbb7e5845df2ac.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bokelur/medicine_dictionary_drugs_free.pdfIn PDF document text
    • http://fuvoxibid.epizy.com/exploration_radiologique_de_l_appareil_urinaire.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/how_to_clean_a_dirty_mop.pdfIn PDF document text
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_f9a2088a28d94e71b6e78ad79fb3c739.pdf?index=trueIn 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_off00014476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14476 5128 bytes
SHA-256: debc37e09315b9a15406cdc36d1c7fccf22a949676a1942fff6c3d18d82ba18a
font_01_sfnt_off000155ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155ED 12000 bytes
SHA-256: 6243791c8530d18c3e8625761579f7f2cc03e0eeb11d4c31b7fa6af14ba36f67

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