Malicious PDF — malware analysis report

Static analysis result for SHA-256 00381a34a71da42c…

MALICIOUS

PDF

74.4 KB Created: 2020-12-30 02:24:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b1e17f134982796139d0033dffc49e08 SHA-1: 9987241673f9c7e3c825848123f02ff67bb04f91 SHA-256: 00381a34a71da42c52d07cdfcf4887a51f8f2a91a50ae097ef2e9717898aba8f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many hosted on disposable domains, characteristic of a link farm used to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/strik?utm_term=download+breakfast+cooking+mania PDF link annotation
    • https://cdn.sqhk.co/wolitobutak/Svif4vx/90_meter_smart_card_manager_software_download.pdfIn PDF document text
    • https://cdn.sqhk.co/juvexafi/gtgggqj/pubg_mobile_metro_royale_download_global_version.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388276/normal_5f93cc44ac5e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426547/normal_5faa3bdb02c1f.pdfIn PDF document text
    • https://xowuxuwakewobi.weebly.com/uploads/1/3/4/8/134853014/jatoputeka.pdfIn PDF document text
    • https://cdn.sqhk.co/xafiguzi/hjfDYjc/21075609775.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369760/normal_5f93d2b00f252.pdfIn PDF document text
    • https://cdn.sqhk.co/zixajofazadi/agihfib/free_fire_hd_wallpaper_1920x1080.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448558/normal_5fd78c388fd7e.pdfIn PDF document text
    • https://funebaxap.weebly.com/uploads/1/3/4/3/134399245/tixive_vutupo_jibejav_gajotasadiboriw.pdfIn PDF document text
    • https://lepepapiminokuj.weebly.com/uploads/1/3/4/4/134493398/zomawutalojotep_kunalop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445880/normal_5fcd31c665d69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383923/normal_5fa10550c7cca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488090/normal_5fa963ee6e393.pdfIn PDF document text
    • https://letitunonagafi.weebly.com/uploads/1/3/4/4/134494227/3440429.pdfIn PDF document text
    • https://jajaleregonu.weebly.com/uploads/1/3/4/2/134235513/c8d023af5.pdfIn PDF document text
    • https://cdn.sqhk.co/xetajikok/jbgcidk/bevixiratalimirujoxusa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFB 5636 bytes
SHA-256: ef93ec48b5f231c996ce6464cae809afccb78d5ee6d9b3e66f9625e9e47bad42
font_01_sfnt_off0000ee31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE31 14800 bytes
SHA-256: cabd0c3c30c1c478e578822cdba653170e138c0c3e117527db739fa9b60ddc2b

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