Malicious PDF — malware analysis report

Static analysis result for SHA-256 76edac8a5dbbd365…

MALICIOUS

PDF

82.7 KB Created: 2021-03-21 00:04:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e26be69cc3aae4b9864a6af771b2f0b4 SHA-1: b75093d28a91e209142e97f48374c721694de2aa SHA-256: 76edac8a5dbbd3651b1983a0cad68e4e9ae400fdb8e9d27a066c598297398eb9
126 Risk Score

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 0.9992

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://dafemum.ru/aws?utm_term=how+to+fix+middle+ear+problems PDF link annotation
    • http://zijukikov.mypressonline.com/october_2020_calendar_printable.pdfIn PDF document text
    • http://valigulepi.scienceontheweb.net/31588775223.pdfIn PDF document text
    • http://goladelexugezi.sportsontheweb.net/ruxodu.pdfIn PDF document text
    • http://zomolejefej.mywebcommunity.org/gozuxo.pdfIn PDF document text
    • http://ferategaj.scienceontheweb.net/discrete_mathematics_book_for_gate.pdfIn PDF document text
    • http://pusovemolexed.scienceontheweb.net/fagejenuforozojisaxojo.pdfIn PDF document text
    • http://rubewox.sportsontheweb.net/kojivabugas.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://eecb1da5-82b7-48ef-90e5-6a20895c07e7.filesusr.com/ugd/88a84f_afb896657eda400a88a8f0b612bd38ef.pdf?index=trueIn PDF document text
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_7d9b3ca31d724b469147573f6e433b9e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f334eae4-0074-4536-8ee7-8e45d2461b6c/viwagaxirakugegu.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/information_retrieval_systems_in_libraries.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/representational_state_transfer_rest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54156696-20d1-4ca4-bf40-8cdbb5172cff/93285067825.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/kimavifadusaxadamojuweva.pdfIn PDF document text
    • https://fdb0147f-387d-4908-9c93-1ccdb5bf775f.filesusr.com/ugd/aea2e0_07a5c58b4c7f48a69a82ebb04ff34391.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/767653bb-2e7d-4243-9f0b-f987dc06195f/how_to_read_table_a_statistics.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/que_es_la_destilacion_del_petroleo.pdfIn PDF document text
    • https://441768bb-9839-4df4-8f78-dd1233b527f6.filesusr.com/ugd/7e6080_ca317ae3e5544633ae113244a776edfe.pdf?index=trueIn PDF document text
    • http://nosigegu.onlinewebshop.net/19524195349.pdfIn PDF document text
    • https://72dfff08-f6cb-4f5d-aaac-ebe71175d6a6.filesusr.com/ugd/c268f7_1ae5044862aa4225857a1f6e01ae66dd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/91b498e3-2f15-4105-b1dc-58353306fea8/vusawobitapeval.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd194275-2796-471d-8984-e88c54b2e7c5/environmental_science_merit_badge_pamphlet_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2957f175-1d3c-4a66-b62e-53b12875a5aa/pakixom.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_off0000f6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C7 5132 bytes
SHA-256: 98b34a0d1dba7ad5870e5937dd5ac20393a4727ef545bc8308051f0924e821d8
font_01_sfnt_off00010840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10840 10964 bytes
SHA-256: 988e48c81c316be8b28f9091e4eae0bc59429cf94f9e78fdf851021b0731690a
font_02_sfnt_off00012d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9B 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f