Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4e74989ca0aa6d…

MALICIOUS

PDF

75.2 KB Created: 2021-04-26 07:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0ed06b3538853836ae48762b707a5e63 SHA-1: 308d7618d6062fe5761204c289b27eb711890d1d SHA-256: 1b4e74989ca0aa6d59d050f0eb2e51f5289343013080450432582430019ea0b0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious or link-farm websites, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains text related to APA formatting examples, serving as a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/strik?utm_term=ejemplos+de+formato+apa+de+paginas+web PDF link annotation
    • https://jowomuzixife.weebly.com/uploads/1/3/4/6/134634296/5789700.pdfIn PDF document text
    • https://jaweditulopo.weebly.com/uploads/1/3/4/3/134313576/4212175.pdfIn PDF document text
    • http://fajasated.mywebcommunity.org/tintin_et_le_secret_de_la_licorne_film_complet_en_francais_streaming.pdfIn PDF document text
    • http://sozapemogoz.mygamesonline.org/wozig.pdfIn PDF document text
    • https://dozexida.weebly.com/uploads/1/3/4/5/134590021/xevaxe.pdfIn PDF document text
    • http://wosozage.mypressonline.com/430739135.pdfIn PDF document text
    • https://duzareledibasa.weebly.com/uploads/1/3/4/8/134890493/kurotun.pdfIn PDF document text
    • http://tututot.mygamesonline.org/vafota.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/zemunomipazikez/12964808331.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/langston_hughes_i_too_poem_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ac7b4ac-8164-4df9-bde4-851478765ecb/change_ink_cartridge_hp_deskjet_f4580.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14e04fc0-1926-46f2-9da6-de9338ac97c3/ff7_remake_hard_mode_build_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63637dbf-7dce-4564-93cd-4982416ab964/zarefutezagi.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/how_many_calories_in_carvel_ice_cream_cake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87c0c74f-dc00-4f32-9b3b-88f520fa4136/coast_guard_staffing_standards_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/6752412981.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/80303655265.pdfIn PDF document text
    • http://tebaputazaxuva.myartsonline.com/parvana_full_book.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/ccna7_final_exam_answers_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/33640394386.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c585f20b-ccbb-45a7-99ff-20c14115583f/the_hound_of_the_baskervilles_audiobook_chapter_1.pdfIn PDF document text
    • https://s3.amazonaws.com/kiremefegonar/how_long_do_gopro_hero_3_batteries_last.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_off0000e451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE451 5628 bytes
SHA-256: 02eeec77a654e31fabbd6e7c93e507cde459245019adb4301838d269303c86f2
font_01_sfnt_off0000f770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF770 12268 bytes
SHA-256: 72e38ba6e07f2a3b512dd2642e0490b620ec41961c56fea77032bb49a7971ba7

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