Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe592c816fd59a0…

MALICIOUS

PDF

76.8 KB Created: 2021-03-27 23:05:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4bdb847b27f054b9b39444246d9edd7a SHA-1: 12a50ed517476eb047d818fa77592e09e5133433 SHA-256: cfe592c816fd59a01ae3960c0c90a36461c401728b0e7187cc8e7955849cc024
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://lozipotod.ru/award?keyword=astrology+books+in+english+pdf+free+download PDF link annotation
    • http://xufelaketodo.getenjoyment.net/best_networking_questions.pdfIn PDF document text
    • https://dugizixenopiloj.weebly.com/uploads/1/3/4/4/134457585/pofakuroribamot.pdfIn PDF document text
    • http://tajuliwelofiti.medianewsonline.com/zolised.pdfIn PDF document text
    • https://lozuninusagutog.weebly.com/uploads/1/3/5/3/135309735/9932a62b4e63.pdfIn PDF document text
    • http://kiritisivasol.mywebcommunity.org/kegigaputubef.pdfIn PDF document text
    • https://kuburabet.weebly.com/uploads/1/3/4/3/134362545/bdc01f12a5.pdfIn PDF document text
    • https://pimujupaz.weebly.com/uploads/1/3/4/4/134440235/ee0c71b.pdfIn PDF document text
    • https://tujakiko.weebly.com/uploads/1/3/0/8/130814553/noduvupevezigunujize.pdfIn PDF document text
    • http://kokulotasuz.mygamesonline.org/72872360641.pdfIn PDF document text
    • https://zusadubojurumez.weebly.com/uploads/1/3/4/7/134703186/74406466b.pdfIn PDF document text
    • http://dalidusiz.mywebcommunity.org/wufuzilasizivazob.pdfIn PDF document text
    • https://widonudafedezu.weebly.com/uploads/1/3/0/7/130776490/53b3a.pdfIn PDF document text
    • https://fomilapemarujan.weebly.com/uploads/1/3/0/8/130814088/jadamumagebosu.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/4c446c28-43f2-44f0-bba0-93e134695b0f/ariens_classic_24_in_208cc_two-stage_snow_blower_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5d7eead-21fe-4784-a605-aab63f306535/best_basic_english_grammar_book_in_hindi.pdfIn PDF document text
    • http://pebomotixot.myartsonline.com/gettysburg_address_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1183e32f-9ae2-4ad2-90aa-d8944f1da2b0/how_to_fix_a_samsung_tablet_that_is_not_charging.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba264024-a810-40cb-b2b1-2eabac6a81b6/77627627862.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea580721-19a9-40ff-a5b7-cd3d1c2520aa/48079256665.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daa34053-6dc6-4734-a4dc-8c59ca2104bc/simon_companys_year-end_balance_sheets_follow._compute_days_sales_uncollected.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ef485ec-8f4d-4622-8fe2-6f9ac50f305e/ge_profile_microwave_filter_light.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_off0000d791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD791 5688 bytes
SHA-256: 02f7ec0896a70bc8ae7178b55b6c56dfcc26978892d91bf6e9dc55b10fe321a5
font_01_sfnt_off0000eb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB02 10320 bytes
SHA-256: 8dfa9762d0791edbc6c22054bdcbb62cdf04d7f0d437919ae267956773ce87c6
font_02_sfnt_off00010e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E97 16140 bytes
SHA-256: f7bf09266f8ecbef485549f1326dbb54634fea06f90d2876ad909828df7531a4