Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f1f3dd7716ac84…

MALICIOUS

PDF

84.7 KB Created: 2021-05-19 19:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b4b93569afe5bf923523df097a0dfe9c SHA-1: 56e2b452cf67f6a706252c093790c64ae9f90af0 SHA-256: 84f1f3dd7716ac84f7332476bf276f0d6b4a4069c65383111bf90a0b2639810d
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fokemale.ru/strik?utm_term=how+to+make+origami+heart+printable+instructions PDF link annotation
    • https://salabupomisopef.weebly.com/uploads/1/3/4/6/134631393/gikomagowuletogepavu.pdfIn PDF document text
    • https://kifesajisibak.weebly.com/uploads/1/3/4/8/134884742/8707125.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480886/normal_600b9d03e00db.pdfIn PDF document text
    • https://fumabufoduf.weebly.com/uploads/1/3/5/3/135313851/44a9f170fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383449/normal_6054f0f518b2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497075/normal_603a87d603dbc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416321/normal_5ff8baf9b4224.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373241/normal_600f0aeb17e67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465938/normal_604b39261c125.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/fadobirak/can_you_still_buy_film_for_polaroid_land_camera.pdfIn PDF document text
    • https://s3.amazonaws.com/filidabut/wifugo.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/langston_hughes_harlem.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/kifutimokumofefa.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/canva_online_resume_template.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/documentary_photography.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad729cd2-b42c-4376-8dce-21d9ffb33c98/67584459367.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/feca2f0c-fb94-493d-b3ab-abe96def4730/how_do_i_check_my_starbucks_gift_card_balance_without_an_account.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/calendario_escolar_2019_y_2020_sep.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/30191283650.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe6d3d8a-1865-47ca-abbf-ddc5ac6c0618/where_can_i_watch_the_spook_who_sat_by_the_door.pdfIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/android_app_to_auto_answer_calls.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7441980b-f8ee-418a-be74-8804835020e8/dovemuro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6cfd830-9f46-45de-9d88-bc7efe05edd8/shepherd_the_flock_of_god_2019_jwpub.pdfIn PDF document text
    • https://s3.amazonaws.com/padanivozeb/adventure_full_movie_in_tamil.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_off00010a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A69 5604 bytes
SHA-256: d4e7d5735425d695ca6e69ac1ce5ecbaa72eee92f2f1946cbc93d9545983a2d6
font_01_sfnt_off00011d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5A 11516 bytes
SHA-256: 98901fa956324a10a267b30c2bb56a137bbedd5e42f3277e7e0b440b1716fd1a