Malicious PDF — malware analysis report

Static analysis result for SHA-256 e88af2fadbece282…

MALICIOUS

PDF

73.9 KB Created: 2021-03-19 19:12:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 31dbc8339a6ed796373367e76f9d4f5b SHA-1: 40047c0db8a97424df54529b5bdb538d59945aad SHA-256: e88af2fadbece282566e6eb8bd2e526600d3c362dfac095da682bc8bbb876e5f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing or redirection attack, potentially leveraging JavaScript within the PDF structure.

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://leonvi.ru/123?utm_term=cardiac+rehabilitation+programme+pdf PDF link annotation
    • http://mopomelodow.iblogger.org/bawiwakalatodiwa.pdfIn PDF document text
    • https://kufobuzu.weebly.com/uploads/1/3/5/3/135330794/ef413d.pdfIn PDF document text
    • https://xavapijiwo.weebly.com/uploads/1/3/3/9/133997403/natafapuwap.pdfIn PDF document text
    • http://gululujenij.22web.org/73895332483.pdfIn PDF document text
    • https://nirejabepifu.weebly.com/uploads/1/3/4/2/134266024/c528ea89dbb4b.pdfIn PDF document text
    • http://montana-media.com/8255814463148l2m.pdfIn PDF document text
    • http://dmgameplan.com/addition_and_subtraction_worksheets_2_digit_numbers0jh5y.pdfIn PDF document text
    • http://astrohelp.space/55690813341i8i3k.pdfIn PDF document text
    • http://asia.kiwi/sony_wega_trinitron_21_inch_tv_pricepa4xb.pdfIn PDF document text
    • http://copyrightsupport-ig.com/koxidevaxukajfnet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388421/normal_601739b81e746.pdfIn PDF document text
    • http://trynutra.shop/zaviliso4vf6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377679/normal_5ff512cd1f9da.pdfIn PDF document text
    • https://niritopep.weebly.com/uploads/1/3/4/6/134634222/7393505.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379970/normal_600291419a903.pdfIn PDF document text
    • http://afracheat7.xyz/monikune5rkiq.pdfIn PDF document text
    • http://hamlikjorettoop.ru/how_to_fix_ge_dishwasher_detergent_dispenserfjw3j.pdfIn PDF document text
    • http://badgesverified.com/mokifekugupujozamuvukvwb2b.pdfIn PDF document text
    • http://lami-lashes.site/sudilukoxm1l5.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/424e93d8-e472-49a8-92fa-9c3c2f4a621d/68523205936.pdfIn PDF document text
    • http://jekutekovemimav.rf.gd/31134999008.pdfIn PDF document text
    • http://doxefozogad.epizy.com/que_es_el_radio_atomico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6904c0c-6ced-44d3-b01f-01126e1e993b/wusiwojena.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_off0000e3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DB 5436 bytes
SHA-256: 143024ccee5e2cbdcb9321c0dd254954f65cbde71ab3ad5f848b6102a7d4002d
font_01_sfnt_off0000f625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF625 10408 bytes
SHA-256: d5f68ee3029b9ec1b6bc87ebe5f363dba0f00d0ca43d1d87a7cf1f7393b878fb

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