Malicious PDF — malware analysis report

Static analysis result for SHA-256 b80332f7a99607be…

MALICIOUS

PDF

82.5 KB Created: 2021-03-18 08:52:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 65c581a1c0c1d03491000556d4176e17 SHA-1: 11657096ad33ef6778be08a8618eea9ecfaa891b SHA-256: b80332f7a99607beba423b3e08584f9485a55c2dcccd6d5371b2ddd55bbaaa1a
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 0.9996

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://ponafet.ru/award?keyword=algorithms+in+java+parts+1+4+robert+sedgewick+pdf PDF link annotation
    • http://ecoterritory.store/221059934086735g.pdfIn PDF document text
    • https://vopisozojozesa.weebly.com/uploads/1/3/1/4/131407388/gekufajosojekusemuba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426823/normal_5ff371059b5d0.pdfIn PDF document text
    • https://jutijodofolumel.weebly.com/uploads/1/3/4/0/134012985/e29c2d4d39b3b2d.pdfIn PDF document text
    • http://nncucuucuc.space/ecology_and_environment_mcqsrbys.pdfIn PDF document text
    • https://sijejanuri.weebly.com/uploads/1/3/4/8/134861930/rabijegepe_daranakekuvuxo_faginomu.pdfIn PDF document text
    • http://kalinakudukutim.22web.org/bruno_mars_i_am_your_man_chords.pdfIn PDF document text
    • http://xibipumazanepir.iblogger.org/el_nuevo_houdini_in_english_chapter_3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415300/normal_5fefdaad09f53.pdfIn PDF document text
    • http://nodalaxav.22web.org/sixirajumalofavudopol.pdfIn PDF document text
    • https://boduburul.weebly.com/uploads/1/3/4/6/134654649/8261159.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb6a51c9-0cd6-45a7-b0d8-91d0c81e1ed3/why_is_my_tablet_charging_so_slowly.pdfIn PDF document text
    • http://vaforapibasaw.epizy.com/midobom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3912261-8d38-4dd7-add6-2f95d2ba80cb/nobabumonulupirukokovilas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be2fd7f5-18ef-4d1d-8255-d591b16de3fa/12786471240.pdfIn PDF document text
    • http://fiviwuzovalexop.rf.gd/pulowebobefifawiku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b52eac51-ffea-4fe0-907b-7fe6ae011f13/how_to_rig_a_fly_rod_for_trout.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96659b91-3952-4153-baf6-b1b3575604a1/sujupapuzopomi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65716877-cd22-4560-bff2-c1624fca58a4/95897942799.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc18c716-a980-4ac1-ae48-5e248df50d9e/will_shatter_meaning_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e44cbc1-ff66-444e-92e5-49cb700f58e8/are_ativa_shredder_bags_recyclable.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADE 6132 bytes
SHA-256: 4c0b39160857ff7384df7a4f498b7b81d4887493281b0b82e2aff15a94c2ff4a
font_01_sfnt_off0000ffb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB9 11484 bytes
SHA-256: 126f561b824a23e27b3c961081b1226896dd1592d7565f877f51019fd8a9abbf
font_02_sfnt_off0001268a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268A 16144 bytes
SHA-256: c86dd2e8eb9073f5525c3b0ae269a7213f91b44edbf915aca2fe1d7e9d6d56b5