Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c89fa315a64d3f1…

MALICIOUS

PDF

79.7 KB Created: 2021-02-27 22:37:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d70ab6a27afca2ba179c67a59c7061ab SHA-1: ae5e0f4301a9a5034efa1c51c652c0b3a188b9f5 SHA-256: 3c89fa315a64d3f1896bd9534a5ca7681fa9667c1744abfc9bb73d2275e106b2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely serving as a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/aws?utm_term=the+three+billy+goats+gruff+little+golden+book PDF link annotation
    • https://cdn.sqhk.co/tedubifo/fvAgdja/53025504775.pdfIn PDF document text
    • http://dumubemajizukov.medianewsonline.com/song_of_solomon_1_15_2_4.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/purisomedolepopatu.pdfIn PDF document text
    • http://lebedugipul.mywebcommunity.org/soxakonugojovezetazu.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/jqOwlgh/tank_hero_laser_wars_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/ridijafugemi/g91fb7j/lego_cops_and_robbers_videos.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/icWOGic/flip_phones_for_seniors_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/fekerepusa/Oidxijg/83028989542.pdfIn PDF document text
    • https://cdn.sqhk.co/bidekidarub/jifijuS/tonit.pdfIn PDF document text
    • https://cdn.sqhk.co/bomumuxa/dbgghbY/mifujepesaxawi.pdfIn PDF document text
    • http://xitabijasava.getenjoyment.net/black_ice_key_and_peele_transcript.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/ratixifo/africa_song_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/genedapabunagux.pdfIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/hp_designjet_500_printer_plotter.pdfIn PDF document text
    • http://jopivot.rf.gd/riluviwenogezoji.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/certificado_leed.pdfIn PDF document text
    • http://pabewuvuxaf.onlinewebshop.net/tabla_de_conversion_de_centimetros_a_pies_y_pulgadas.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/dalvik_bytecode_editor_apk_2017.pdfIn PDF document text
    • http://sikofus.epizy.com/mukaduluj.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/36495164808.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_off0000f98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98F 5424 bytes
SHA-256: 1b0b6d2989be110928c304d6c3f2df0f7c5263e6d26e8a0ac14ebdc8e978ac6d
font_01_sfnt_off00010bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFD 10328 bytes
SHA-256: 4fbc472d13ba04c036aa2a786bd15b86beff45e941911abea62634c2844086c9

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