Malicious PDF — malware analysis report

Static analysis result for SHA-256 feb26d721e2c3cfe…

MALICIOUS

PDF

81.1 KB Created: 2021-03-15 18:28:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8ac3741dd2603606fc20a74cb47fa04 SHA-1: dc04911780af31465018f8a598a45253bc2561af SHA-256: feb26d721e2c3cfe7fa7a8e3f112b7aa013eed1d8fa04a9030754fcdc3973c80
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to improve SEO, and one specific URL points to a lure related to iTunes gift cards. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or redirection to a malicious site. Although no scripts were explicitly extracted, the PDF structure and extensive external linking suggest it's designed to lead the user to a compromised or malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/wix?keyword=itunes+gift+card+not+activated+no+receipt
    • https://static.s123-cdn-static.com/uploads/4406809/normal_5fcf67ff27eaf.pdf
    • https://pufukowog.weebly.com/uploads/1/3/4/5/134583281/nigevejexivakasuju.pdf
    • https://static.s123-cdn-static.com/uploads/4369486/normal_5feeacce219cc.pdf
    • https://wukelefitifaka.weebly.com/uploads/1/3/4/8/134882985/2bda1971b25.pdf
    • https://wopadutizibum.weebly.com/uploads/1/3/4/3/134306931/5190145.pdf
    • https://xigujevaw.weebly.com/uploads/1/3/4/7/134701692/40657ef11.pdf
    • http://beririka.scienceontheweb.net/wild_magic_tamora_pierce_audiobook.pdf
    • http://manuximaxemeje.scienceontheweb.net/what_do_the_symbols_mean_on_a_portable_air_conditioner.pdf
    • https://xudagemiribu.weebly.com/uploads/1/3/1/3/131378943/galib_dedoguzonirag_suxedegudineva_zosiriluwetumed.pdf
    • http://gafabotipunofu.mywebcommunity.org/french_english_frequency_dictionary.pdf
    • https://ditoleruv.weebly.com/uploads/1/3/5/3/135345680/68b3acdb.pdf
    • http://nowukusox.mypressonline.com/sociology_terms_and_concepts.pdf
    • https://tejukikefuxod.weebly.com/uploads/1/3/4/7/134703803/63e2c3b.pdf
    • https://cdn-cms.f-static.net/uploads/4375694/normal_5fd0a9b86df55.pdf
    • https://jewefero.weebly.com/uploads/1/3/1/3/131383264/84ec425.pdf
    • https://cdn-cms.f-static.net/uploads/4443624/normal_603b72364946f.pdf
    • https://cdn-cms.f-static.net/uploads/4409394/normal_6034ca04ca50b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wepogevadapafa.atwebpages.com/paleo_hebrew_alphabet_chart.pdf
    • https://a50dbba5-e4fd-40cc-afa9-a45495a5accf.filesusr.com/ugd/7f929b_641e1c9bcaa64faab6f648d991193d8f.pdf?index=true
    • http://wiwosotu.myartsonline.com/polk_magnifi_max_soundbar_system_specs.pdf
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_bc94e99edf704a42ae467549893dc3f2.pdf?index=true
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_385b914fe87a4496919308c7e9dd3585.pdf?index=true
    • http://lurarapekakaka.atwebpages.com/41309806682.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd04.bin
b0e152296c8e87b6390c6b43ef9fd2a0f0a844208b5b6249c6cfaba4003f4781		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD04 5288 bytes
font_01_sfnt_off00010f23.bin
b192c90207c3fedbb503da3cb4d283feb44cf70d9aa4f35a5d6ad9effdc74799		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F23 11472 bytes

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