Malicious PDF — malware analysis report

Static analysis result for SHA-256 57327287c6691fdd…

MALICIOUS

PDF

70.5 KB Created: 2021-03-14 21:29:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ee4f88a2788c8a7c02807f39690e5feb SHA-1: 8d474b709f571a5867f000d9e7a81fa32f9384f6 SHA-256: 57327287c6691fdd6c7045e446ec531e59d286f34399267258b1db8d8b254b6b
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a significant number of external links, suggesting it functions as a link farm or SEO spam document, potentially leading to phishing sites or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

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 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.
  • 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://jumiwimov.ru/award?keyword=21+cfr+part+113+pdf PDF link annotation
    • https://bisutofudumi.weebly.com/uploads/1/3/4/6/134663563/f5be2e3a566cad.pdfIn PDF document text
    • http://bbflowers.net/holy_bible_esv_vs_nivxskqy.pdfIn PDF document text
    • https://kupelaranix.weebly.com/uploads/1/3/4/7/134729830/9460893.pdfIn PDF document text
    • https://cdn.sqhk.co/sapidefapo/icgjKig/xupeju.pdfIn PDF document text
    • https://romudemul.weebly.com/uploads/1/3/4/8/134886817/1891797.pdfIn PDF document text
    • http://help-service-support.com/agar._io_mod_apk_2._5._6osu23.pdfIn PDF document text
    • https://cdn.sqhk.co/niririga/jjK0nnZ/death_park_scary_clown_survival_horror_game_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/noremixujor/ha2gjHI/last_knight_of_europe.pdfIn PDF document text
    • http://leafester.online/how_to_become_a_master_storyteller_on_picsartw5kop.pdfIn PDF document text
    • https://folugaso.weebly.com/uploads/1/3/4/5/134503816/kugogidazi_kadapuvib_nawajaguruzeno_gesofujepaz.pdfIn PDF document text
    • http://znasila.ru/why_is_my_nest_thermostat_not_turning_onpsse4.pdfIn PDF document text
    • https://cdn.sqhk.co/jusulikipe/f8x8gjj/spill_it_out_idiom_meaning.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
    • https://s3.amazonaws.com/sevoga/fitness_magazine_cover_template.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/without_remorse_book_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/rising_of_the_shield_hero_light_novel_vs_anime.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/customary_law_marriage_in_zambia.pdfIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/chamberlain_hd900d_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/what_does_the_arrow_mean_in_chemical_reaction.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/59386417236.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_off0000ca78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA78 4600 bytes
SHA-256: 980a3eaed705627ffb328472edc14dea3ef417e6491e60f5482b47389d31af16
font_01_sfnt_off0000da12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA12 10936 bytes
SHA-256: 7a92dc46f037fd13c4dbc72707bc7dd182f2a9a4a0366aeb4bd9c89b565e2e71
font_02_sfnt_off0000ff3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3A 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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