Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a07861d900a6310…

MALICIOUS

PDF

101.4 KB Created: 2021-04-18 12:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2f764a3dac95b24cfbb1bb4974f7c9d8 SHA-1: 2f47cf0f9509ab301b5b4836abf2a6ed0921f94a SHA-256: 3a07861d900a631035f8c35107d5b2f976dd502ba4dba4143bbb05a61c31c8bb
146 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. It uses a callback-phone (TOAD) lure. 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://xezojetit.ru/strik?utm_term=jaime+giraldo+angel+metodologia+y+tecnica+de+la+investigacion+juridica+pdf PDF link annotation
    • http://wide-mean.top/how_to_fix_broken_headphones_wire_without_soldering7l2hd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402745/normal_60691a68d17fc.pdfIn PDF document text
    • http://myfavoritesun.xyz/72777570717snr0y.pdfIn PDF document text
    • http://apparently-home.com/us_work_permit_application_formg28fp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477401/normal_602cb03887755.pdfIn PDF document text
    • http://allfreebets.ru/91581930741mwrm2.pdfIn PDF document text
    • http://lidagejelotodu.22web.org/fimakifanak.pdfIn PDF document text
    • http://vorecan.space/man_in_the_mirror_book5m1y5.pdfIn PDF document text
    • http://leree4.club/warafixazoyls6p.pdfIn PDF document text
    • http://tublitalia.fun/koberikunutusixaryo7xu.pdfIn PDF document text
    • http://lezozopose.iblogger.org/jivuga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477139/normal_600d61c99336f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379371/normal_602c40e719320.pdfIn PDF document text
    • http://hhizmet.com/34953437919ygpcu.pdfIn PDF document text
    • http://nebibila.iblogger.org/payment_invoice_template.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://todizegi.epizy.com/telecharger_whatsapp_2018_apk_pour_iphone.pdfIn PDF document text
    • http://timofojitowamut.epizy.com/paneneremepu.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_off00013e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E3D 1528 bytes
SHA-256: 2d84ae0636942eb5063defe9e2f34a76032a15a437a22af272f09e81a5429577
font_01_sfnt_off00014604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14604 5700 bytes
SHA-256: d830dc40d4497175cc2578cd62b716b778259db57d7b53f9b2eca8d8a6cbb5cd
font_02_sfnt_off00015976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15976 14020 bytes
SHA-256: a2cb51e5e64ca5d4277bab9e8b46580a44991bf59df0301ad8742efafe4af0bd

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