Malicious PDF — malware analysis report

Static analysis result for SHA-256 aad78f89885c7266…

MALICIOUS

PDF

73.6 KB Created: 2021-03-20 20:09:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e1661ab58773dedc4b5721fe91362468 SHA-1: 57da9e390470cb3921adc9f2fea77f7b92426293 SHA-256: aad78f89885c726628c783a1f9dfda7f58501d7b7991a86aac41fb9e76cee311
146 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. 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 0.9988

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 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://gimoguvi.ru/wix?keyword=english+bulldogs+for+sale+duluth+mn PDF link annotation
    • https://kumobavubisu.weebly.com/uploads/1/3/0/7/130775432/4133406.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492529/normal_601efa91177c7.pdfIn PDF document text
    • http://vuwimoxit.mygamesonline.org/jekuserurusarinimalafu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393790/normal_60129dc59900b.pdfIn PDF document text
    • http://jafoxidulez.mypressonline.com/facility_location_factor_rating_method.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482858/normal_604e963d5898c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454303/normal_5ff89d2307978.pdfIn PDF document text
    • http://gakivako.iblogger.org/proper_address_format_one_line.pdfIn PDF document text
    • https://levunabul.weebly.com/uploads/1/3/1/4/131407164/6a467de9252.pdfIn PDF document text
    • https://rudarizegofuk.weebly.com/uploads/1/3/4/3/134355262/657424.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/mountain_america_credit_union_promo_code.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459470/normal_60018830c7fca.pdfIn PDF document text
    • https://zojujevekuki.weebly.com/uploads/1/3/0/9/130969212/34b0cc4135ca500.pdfIn PDF document text
    • http://refoxedij.iblogger.org/7478120670.pdfIn PDF document text
    • https://tajezutudod.weebly.com/uploads/1/3/1/3/131398094/b850211a47.pdfIn PDF document text
    • https://popetufuwude.weebly.com/uploads/1/3/1/4/131483025/jedefulorobus.pdfIn PDF document text
    • https://zinuwikisabarek.weebly.com/uploads/1/3/4/6/134679236/palunifitewamox.pdfIn PDF document text
    • https://gilepijojuju.weebly.com/uploads/1/3/2/7/132740412/rosapaj_saxogebuza_vajudite.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xekabotiwuker.atwebpages.com/82933261758.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/waduvebib.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/zaxovufisisem.pdfIn PDF document text
    • http://nifibomagogov.rf.gd/how_to_clean_the_filter_of_a_beko_washing_machine.pdfIn PDF document text
    • http://vebusatoro.atwebpages.com/how_to_sync_jam_plus_speaker.pdfIn PDF document text
    • http://bikikifuxax.epizy.com/twas_the_night_before_christmas_picture_book_online.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_off0000d408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD408 5300 bytes
SHA-256: 8eec7510c31564c238befdfb64ea605a4e27af113c14187c3c7544c804c3760a
font_01_sfnt_off0000e5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D4 10608 bytes
SHA-256: 499da23c562ca079a29981771b71b682047ff6c40048b541d837b7ff78c805a2
font_02_sfnt_off00010a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A38 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230