Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb8ad577fd487a8…

MALICIOUS

PDF

85.3 KB Created: 2021-05-30 00:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4c8076f41a4861ae1d31e8103bc5cd2f SHA-1: 9240e15dd36c927d562f12a4ff87d90fe754b3d8 SHA-256: bfb8ad577fd487a8fde770f17404d091c69d9cad4f5ce0a5a49efea01b5dadde
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://mezovuduw.ru/123?utm_term=archaeology+textbook+pdf PDF link annotation
    • https://batuputuj.weebly.com/uploads/1/3/0/7/130739628/83da45826fbb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428054/normal_5fd3d49bdc3e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372682/normal_5ff2658e09960.pdfIn PDF document text
    • https://pesadoxemanuz.weebly.com/uploads/1/3/4/8/134852899/6ec2b59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369764/normal_604a4155d10c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414515/normal_5fe9304f40fba.pdfIn PDF document text
    • https://wubomedigupuda.weebly.com/uploads/1/3/4/6/134696881/vanozag-firafob.pdfIn PDF document text
    • https://fubagodesipura.weebly.com/uploads/1/3/4/3/134326772/f17e5cc5c.pdfIn PDF document text
    • https://vanazufir.weebly.com/uploads/1/3/2/7/132740694/dovawovupapofezolix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393772/normal_6036b664e0388.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://uploads.strikinglycdn.com/files/c31c3221-9e30-422e-8b77-a926e5d9da0e/what_to_do_when_a_judge_is_biased.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6a6b39b-3e23-47fa-87e8-b6a640c7fc6b/colson_whitehead_underground_railroad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b3144d6-8d90-4a42-9fa9-7c10f5e5a671/how_to_make_magic_spell_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/424c53a2-8c08-4f05-a720-af4e856dac64/make_your_own_carbonated_water_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7817bfd7-9ca4-4201-ace4-42aeb8d5eb33/sonic_menu_ice_cream_sandwich.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a679ff7b-66d3-48b9-ac95-5b1cacc11576/voodoo_lab_pedal_power_2_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6cef60d-fae7-4384-812b-f883d495beae/batumunugebesom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d6303f0-8486-43c5-8e67-3d43b40d6c7e/descriptive_essay_topics_for_4th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46fc6329-5c72-4178-ac72-b67419710144/lalalerinazufupinisomoxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52c1bea8-38b4-44a4-ac74-51fd41b45500/rejala.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e39a7b14-2a39-47e4-9ac6-e39e5b64996e/how_to_say_greek_numbers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd91a87a-7424-4f28-8706-4bbd50080a75/destiny_2_whisper_of_the_worm_quest_2019.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_off00010345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10345 5236 bytes
SHA-256: df248dcca87f1dc5f0a98d31f4f94b9c5830ecdfe4312a2ddc0ec1fb335a80d9
font_01_sfnt_off0001152e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152E 10760 bytes
SHA-256: 863d03180e64332a9e9a483811e4bc21de8bc70d8e7e7902b40a815f5c930f31
font_02_sfnt_off000139c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C0 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378