Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee77433f1429e77b…

MALICIOUS

PDF

95.3 KB Created: 2021-03-24 14:36:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d260b9a658d468515fe907333e8a2040 SHA-1: 1a78794260280ea69e07644469c8fe2043cc5c80 SHA-256: ee77433f1429e77b306f76a9839a69efba0e15a79dfe9175ad913a9ea0dfe3e2
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 are disguised as search results for popular content like audiobooks. The primary malicious URL, 'https://baarspo.ru/strik?utm_term=ranger%2527s+apprentice+book+2+audiobook+free', is likely used to redirect users to a phishing or malware distribution site. The presence of numerous other PDF links suggests a link farm or SEO poisoning tactic to obscure the malicious intent. ClamAV and ML classifiers also flagged this file as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://baarspo.ru/strik?utm_term=ranger%2527s+apprentice+book+2+audiobook+free PDF link annotation
    • http://7lessons.fun/syncopated_rhythm_exercisespm0x9.pdfIn PDF document text
    • http://trenketo.buzz/voguwilanufulopusavosilbjqua.pdfIn PDF document text
    • https://cdn.sqhk.co/lewulula/pg1hhce/26306160771.pdfIn PDF document text
    • http://chempion.coffee/kemomemaxigiwepadeson6ofhj.pdfIn PDF document text
    • https://cdn.sqhk.co/gobenebovi/5ihI10p/tumetizareleme.pdfIn PDF document text
    • https://cdn.sqhk.co/gejixoneku/okNNifB/strange_case_the_alchemist_game.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/zumomasugipeno/67912051622.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d83509a3-c9ec-447f-b0e4-3416ce6a8933/beat_racer_mod_android_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6942b2f2-0f1a-423a-a6f0-e01d8332eb11/does_canon_pixma_mg3050_support_airprint.pdfIn PDF document text
    • https://14319df0-7947-4f0d-bbb3-eaa17d5eb23e.filesusr.com/ugd/c45f38_8c066ce45d7d4943bca1f7d4679cff6a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5116bdd2-6245-485d-b043-5e801ed29951/mechanical_engineering_degree_online_florida.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/what_is_meant_by_gnostic.pdfIn PDF document text
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_c8adc5e2f2d9445ca258be27ad4e4bdb.pdf?index=trueIn PDF document text
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_1a1f566ef8e44103a1b3c50383760db4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mixanaz/63600771298.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/adobe_after_effects_free_photo_slideshow_template.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/pusijasoruwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c3cc1bf-a095-4b1d-a10a-95ed7b5ce2b9/how_to_make_wendys_spicy_nuggets.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/4898038569.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38b79a98-6c36-46bc-97b3-15e7efd5ede7/what_is_the_current_blacks_law_dictionary.pdfIn PDF document text
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_31001ff0f8744683acf3de7522bef058.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/eye_tattoo_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/43210718079.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_off0001349d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349D 5668 bytes
SHA-256: b64b8d7a3e1beb6ed356193547a3a2bd2b18cb4fb6bc8c60901a5d5e9f48d88c
font_01_sfnt_off00014805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14805 11056 bytes
SHA-256: f7a25b847393aeb619786770a3fb690b1b9b0ffb6a5f2ef2fc1aa69f7ded946b

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