Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc05bbd41cd6e5ed…

MALICIOUS

PDF

76.6 KB Created: 2021-02-13 17:49:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: b8dfae3f9c083fbf2633fae7f77e7ea9 SHA-1: b28486c28c1e827b5d46372a6142ae8dd399da72 SHA-256: fc05bbd41cd6e5ed9e2b9aa9a678ab88125feb7cc08f6ff9eb80a6647d54a2bf
134 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous external links, including one to 'maypoin.ru' which is associated with downloading software. The presence of a 'download button' heuristic further supports a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and linked content suggest a malicious intent to trick users into downloading files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/wix?keyword=aptoide+6.5.3+apk+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4469370/normal_5fdeae23bfd28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366978/normal_5fdad751a8328.pdfIn PDF document text
    • https://cdn.sqhk.co/zixifazod/Pfidijc/dijelerisoxuvonuke.pdfIn PDF document text
    • https://cdn.sqhk.co/waximanodif/hjylih5/crossword_heaven_clue_help.pdfIn PDF document text
    • http://koolmaxt.online/new_clinic_fruit_guidelines3ndik.pdfIn PDF document text
    • http://nesobaka3.xyz/5433642188usdor.pdfIn PDF document text
    • http://rezltml.xyz/64106595563xovgj.pdfIn PDF document text
    • http://tefulen.iblogger.org/lezegaximetupufenaxape.pdfIn PDF document text
    • http://totalcreditreport.info/nype_1946_charter_party_form45h63.pdfIn PDF document text
    • http://all-casino.xyz/migutedogagajatizirimej70g.pdfIn PDF document text
    • http://masterpowerpoint.com/aeroflex_pipe_insulation_data_sheetkkqub.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/pjb1Hhf/53111708381.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478398/normal_600b5905166f9.pdfIn PDF document text
    • http://titanovyi-filtr.ru/din_1696232be6.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/jeponowon/matezosejaso.pdfIn PDF document text
    • http://monulaw.epizy.com/dyslipidemia_guidelines_2018_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/normal_pulse_ox_waveform.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/old_ariston_boiler_manual.pdfIn PDF document text
    • http://gedikoti.epizy.com/hyperboloid_of_two_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/triangle_inequality_worksheet_with_answers.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_off0000ef2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2C 5300 bytes
SHA-256: 6952daf077075b5a50b7857a03577b5c9825c97d74d8a90489ace31d1e9e6042
font_01_sfnt_off00010168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10168 10336 bytes
SHA-256: ee40f0e89d307376ffbdf2630e5121609cae708aa38d9469819e10ec17ac55dc

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