Malicious PDF — malware analysis report

Static analysis result for SHA-256 04ad80d737a18d21…

MALICIOUS

PDF

73.8 KB Created: 2021-03-28 16:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 2223f8a819bdc4127aa03625432bd005 SHA-1: 387b9e2cfcb4d8c8e0a30b40a6fb7bf12ebbb164 SHA-256: 04ad80d737a18d21f3de4bc2f62768abdef98861087562d6082e207e12830397
186 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics as a link farm, containing numerous external URLs pointing to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure suggests it's designed to lure users to external sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/123?utm_term=vue+js+console+log+in+template PDF link annotation
    • https://nujetamewude.weebly.com/uploads/1/3/4/8/134881912/xapafebif.pdfIn PDF document text
    • https://bixizevabusiku.weebly.com/uploads/1/3/4/4/134403351/56a09cc60a9e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393761/normal_60036838a6d69.pdfIn PDF document text
    • https://cdn.sqhk.co/pikikunifav/cTgh1TO/ladijamaded.pdfIn PDF document text
    • https://munejubulogulep.weebly.com/uploads/1/3/4/2/134266186/6971428.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473410/normal_5fdf38bd8dec8.pdfIn PDF document text
    • https://nagipunewemog.weebly.com/uploads/1/3/5/3/135315215/fazuf-golex-jolusa.pdfIn PDF document text
    • https://cdn.sqhk.co/rifibimilo/ij9CASi/zuveru.pdfIn PDF document text
    • https://jobalexaxikut.weebly.com/uploads/1/3/4/8/134892204/3621353.pdfIn PDF document text
    • https://cdn.sqhk.co/kedezoge/bcifigH/happy_birthday_to_you_piano_sheet.pdfIn PDF document text
    • https://wokuzavewa.weebly.com/uploads/1/3/5/3/135339714/c056b8a6e5c1d.pdfIn PDF document text
    • https://cdn.sqhk.co/tivomepu/rbhhifB/jvvnl_admit_card_2016.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462075/normal_5ff771d2dab04.pdfIn PDF document text
    • https://cdn.sqhk.co/wikepijosipi/SiiRxrT/griswold_christmas_shirt_plus_size.pdfIn PDF document text
    • https://bopilewe.weebly.com/uploads/1/3/4/5/134523270/wurubimomom-jitej-muneviw-xubuvuxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447089/normal_603f7da92f56f.pdfIn PDF document text
    • https://fazijexin.weebly.com/uploads/1/3/2/7/132741066/silalogefo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392220/normal_5fd18d05a047c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_f39bc67d878d49e680dec1cd3f64a7f2.pdf?index=trueIn PDF document text
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_dd6b50d79ef5427b8a676375c20114d6.pdf?index=trueIn PDF document text
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_e8e173f360454d4293f66bbf4ecafe42.pdf?index=trueIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_38d858a00f09458683e6b1a6f1d39c7b.pdf?index=trueIn 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_off0000dddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDD 5200 bytes
SHA-256: 6375df09beda447ec0387a12b3b9d1e5496a3db5b8df9d1dbdc3081be98f4230
font_01_sfnt_off0000ef8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8A 11912 bytes
SHA-256: fed572b70d0a7ea0f418e5a5756e8766b6bebded1fcc8d5ae371e175c4d6490a