Malicious PDF — malware analysis report

Static analysis result for SHA-256 8637d735b4ffccc0…

MALICIOUS

PDF

78.3 KB Created: 2021-05-01 12:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 57f5676752c297e922a83eceddca6760 SHA-1: 95a7cc5dbb7af0ddbc9898c83529d488f5075119 SHA-256: 8637d735b4ffccc06a709e0deacd55f736373337cd9e07af416571e81aba9d8b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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 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://nipisod.ru/strik?utm_term=sat+subject+test+sample+papers+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4384645/normal_5ffc9d23ad81f.pdfIn PDF document text
    • http://zezasarasojid.mywebcommunity.org/46978936016.pdfIn PDF document text
    • http://pusatokolerax.mywebcommunity.org/59988086733.pdfIn PDF document text
    • http://fagogit.sportsontheweb.net/english_catholic_prayer_book.pdfIn PDF document text
    • http://dutewokoke.22web.org/98724760233.pdfIn PDF document text
    • http://lotukaguw.sportsontheweb.net/road_maps_europe_free_download.pdfIn PDF document text
    • http://pobasomitiji.22web.org/bangla_dua_book.pdfIn PDF document text
    • http://bagawixaj.mywebcommunity.org/delazesefusetugodizaluz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463803/normal_602fbc2feb219.pdfIn PDF document text
    • http://nopezimugabotik.mygamesonline.org/42972415921.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5a2ada08-5b6c-402a-b0df-3636415b461e.filesusr.com/ugd/434ae6_30505acceb0a42df9edf1d5916a1c4a9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b54d90f-5f7e-4e81-b45f-67a41a514972/mewosetaj.pdfIn PDF document text
    • https://80f75f89-a1e3-4611-a0ef-7a704eb82da9.filesusr.com/ugd/0286dd_d92c8cf81eca4a919d78963172230a0b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c88d970-c48d-412d-929e-77ada7b474ff/zuzikapofiv.pdfIn PDF document text
    • https://1fd079ea-3156-4ae8-a0b4-6153e0b529c5.filesusr.com/ugd/e66bf7_0ded6984cffa458183667ca38414c44c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d77e2117-cd6b-4d5c-a003-a2e01a42e653/multiplication_flash_cards_printable_free_1-12.pdfIn PDF document text
    • https://e4586023-485a-43f1-9451-2d404684c5b7.filesusr.com/ugd/95ff22_97632f05b0204848beb3c2ddc5d9f611.pdf?index=trueIn PDF document text
    • http://somutirawil.epizy.com/banking_financial_services_management_notes_for_mba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ad459e7-cfc4-42fb-b78f-27af1f9249fe/27850109520.pdfIn PDF document text
    • http://riledabetime.myartsonline.com/felobaxijak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/696d5bd6-2bf2-4dc0-99fa-0a838f4ce710/zajematiromum.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_off0000f1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A5 5620 bytes
SHA-256: 3b70aa31f29478528d917df268a317b233275e5c31a395b525a2c438e42b0a63
font_01_sfnt_off000104a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A5 11464 bytes
SHA-256: 9635688ed70662cfaf4f760e5c91facca1898d0d678f5e0275f4e58795575d29

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