Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f1aeaeaf779312…

MALICIOUS

PDF

83.2 KB Created: 2021-02-14 09:06:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3918e3da5668955bddc77a0e32264bc2 SHA-1: 9a04194c7450f3e2e5bf69029fda202bf6001848 SHA-256: a5f1aeaeaf779312567a44182d3730c3c8f627007364ad56a873813ddc19d4ea
166 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://maypoin.ru/aws?utm_term=goal+setting+sheets+for+high+school+students PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465149/normal_60165f1d305eb.pdfIn PDF document text
    • http://privateguardingserviceagainstdanger.site/gazezixoparike6n9hu.pdfIn PDF document text
    • https://latitatuforuza.weebly.com/uploads/1/3/1/3/131398212/rinelejimumod_semoxifuse_futokadogi_bemizat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406228/normal_600e3f7e64f88.pdfIn PDF document text
    • https://fidegobopoj.weebly.com/uploads/1/3/2/8/132815019/9073332.pdfIn PDF document text
    • http://natlab.ru/fosinugizegipidegateljdkot.pdfIn PDF document text
    • http://cpskras.website/696066736281mx0m.pdfIn PDF document text
    • https://minaraxu.weebly.com/uploads/1/3/4/7/134765114/1047803.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461205/normal_6006d8a1f11f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446646/normal_600a5d0c9026d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366003/normal_5ffeb2a393d10.pdfIn PDF document text
    • http://refesuf.22web.org/47064065020.pdfIn PDF document text
    • http://limecash.xyz/sajanakikuluwl465p.pdfIn PDF document text
    • https://biziliwedurukax.weebly.com/uploads/1/3/4/8/134889104/19837b5f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lokuvutifinulef.rf.gd/alien_vs_predator_evolution_android_apk.pdfIn PDF document text
    • http://mujevevurisul.epizy.com/fifevogonuxamakifipaxewu.pdfIn PDF document text
    • http://dazoxamawix.rf.gd/acolytes_of_seiryu_guide.pdfIn PDF document text
    • http://mujawonevafo.rf.gd/konica_bizhub_c454e_driver.pdfIn PDF document text
    • http://bunokulenixa.epizy.com/paguxegaro.pdfIn PDF document text
    • http://jajuzefob.rf.gd/terinipilakelizurajager.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_off000108dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DC 5312 bytes
SHA-256: 9418d4becb68005ed4bb0bcc7233f3f382126f2173a380bfada018ca32cccfbb
font_01_sfnt_off00011ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE5 10516 bytes
SHA-256: 6f033f5a57440783519f0c17eb7f111f8bcb288795ee1338491a99a73b3cdbc5

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