Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b6df56183259db…

MALICIOUS

PDF

71.3 KB Created: 2021-03-23 15:02:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01ad85856fdc1bf711b170feb8a55c76 SHA-1: 9f266eb1842f2270f189dfe2afc61c35368a43eb SHA-256: 31b6df56183259db347444f805e0c5a28a41811d7102dc837b31740d364f682d
104 Risk Score

Malware Insights

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

The file is identified as malicious by a ML classifier and ClamAV, indicating a phishing or trojan threat. The document body contains a lure related to a 'Ruger mark 1 air pistol manual' and the presence of an external URI points to a suspicious URL. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics suggest it's designed to exploit users through deceptive content and links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://golowaki.ru/wix?keyword=ruger+mark+1+air+pistol+manual
    • http://mofemaruwek.sportsontheweb.net/26696123167.pdf
    • http://airbin.top/498582839123ck9l.pdf
    • http://zobotalemogi.sportsontheweb.net/nazipaxituwosopufesebeti.pdf
    • http://jakusavu.sportsontheweb.net/sickle_cell_anemia_who.pdf
    • http://kinorio5.xyz/sekiro_feeding_attendantbf1ix.pdf
    • http://sallehq.xyz/how_to_reply_to_an_appreciation_email_from_clientixuc7.pdf
    • http://xozowilozoga.mywebcommunity.org/78660134781.pdf
    • http://tvoy-ogorod.online/what_are_the_seven_pieces_of_the_armor_of_goddgbum.pdf
    • http://lumacy.site/cant_find_samsung_tv_remoteowc0p.pdf
    • http://raicen.com/31104777214rpfar.pdf
    • http://afracheat8.xyz/is_parenting_a_hobbydjzxr.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gibidapasajug.atwebpages.com/wuzinure.pdf
    • https://s3.amazonaws.com/dudigonifu/5717797620.pdf
    • https://s3.amazonaws.com/bibejovixapis/mathswatch_answers_dividing_fractions.pdf
    • https://s3.amazonaws.com/kefodek/al_quran_al_karim_word_by_word_translation_amazon.pdf
    • http://juludiripo.myartsonline.com/92027970419.pdf
    • http://gumomexad.onlinewebshop.net/crochet_seed_stitch_baby_blanket_pattern.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7e8.bin
a1d5a3e56b4447b50cd457475e7a43b2c380aee1edb0ae414db2aba94c0560fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E8 5260 bytes
font_01_sfnt_off0000e9c3.bin
849fde33c7bf9c56aab9fddee1672333d1f82e9474a1dfb4d2bab0a28db11b70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C3 11296 bytes

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