Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1e3428d824b8a9…

MALICIOUS

PDF

88.5 KB Created: 2021-03-07 07:08:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8e63212fef38fa45cd7a57e41af6b9bb SHA-1: 15da68227eb244a604b5746c9b80d59b9da9d374 SHA-256: 5c1e3428d824b8a90328476409c4e332b4c1e4dd1865b5cd7bafe7c23279cbfb
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of a 'utm_term' parameter in one URL points towards an attempt to disguise the malicious link as a search result, likely to trick users into clicking. No scripts were extracted, but the overall structure and URL distribution are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://gimoguvi.ru/123?utm_term=richard+mcelreath+statistical+rethinking+pdf PDF link annotation
    • http://lubenoredeji.mypressonline.com/1021667104.pdfIn PDF document text
    • http://popevuwe.22web.org/advance_directive_form_texas.pdfIn PDF document text
    • http://rmk4sale.xyz/last_day_on_earth_map_guidelufm3.pdfIn PDF document text
    • http://itash.space/30694712783nyws6.pdfIn PDF document text
    • https://woxazalaxit.weebly.com/uploads/1/3/4/2/134235403/pikewijepatafi_lubidarafo_ditukawige_jetiretubo.pdfIn PDF document text
    • http://kulanefimolon.mypressonline.com/best_free_crossfit_programming.pdfIn PDF document text
    • https://rowagikej.weebly.com/uploads/1/3/4/6/134678960/5358323.pdfIn PDF document text
    • http://zomaragexavope.sportsontheweb.net/robert_kiyosaki_quotes_cashflow_quadrant.pdfIn PDF document text
    • http://ganitigusawev.mygamesonline.org/gigolewiwuvakivox.pdfIn PDF document text
    • http://hihikane.space/tukipedapurgpp1i.pdfIn PDF document text
    • http://pugisapi.mypressonline.com/nosinemoni.pdfIn PDF document text
    • https://muwikoli.weebly.com/uploads/1/3/2/7/132740525/bezukezegeva.pdfIn PDF document text
    • http://supportcopyright.net/wahl_5-star_cordless_detailer_li_hair_trimmerzfsl0.pdfIn PDF document text
    • https://xalitizamer.weebly.com/uploads/1/3/4/8/134863297/fomosuserivusubitus.pdfIn PDF document text
    • http://zimezobot.getenjoyment.net/67570409817.pdfIn PDF document text
    • http://apparentlyopt.com/name_generator_dnd_half_orc8yc54.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sisizovomejefi.epizy.com/50_shades_of_grey_songs_lyrics.pdfIn PDF document text
    • http://fojosotum.myartsonline.com/how_do_i_reset_my_radio_thermostat.pdfIn PDF document text
    • https://s3.amazonaws.com/fivebo/pikivujejitunoxego.pdfIn PDF document text
    • https://s3.amazonaws.com/zafibimutadoti/gisulonib.pdfIn PDF document text
    • http://joriboka.epizy.com/marvel_studios_logo_font.pdfIn PDF document text
    • http://pulutugorivexek.atwebpages.com/26118931254.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7A 5316 bytes
SHA-256: d1e914a6412a4300a30e6b1665961b2911ee6dc84c947129bcfb4bf0eb270769
font_01_sfnt_off00011d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6A 12304 bytes
SHA-256: e59696bf8883c5ab02d933815f75b0ec602dbb4145c469a2cb10b4bf776438f1
font_02_sfnt_off0001462c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1462C 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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