Malicious PDF — malware analysis report

Static analysis result for SHA-256 2da9982f5ad25e0c…

MALICIOUS

PDF

79.2 KB Created: 2021-03-17 03:59:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c183d077feaf4fffc3b669dfb657534 SHA-1: 27cd8e0bd3cc2d4e1646699e7e5fbb1d115cdf77 SHA-256: 2da9982f5ad25e0c3e3b60eb3bb0c2e37344fb87c10132f7de90d2e010ba799f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing sites. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • 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://soxebez.ru/wix?keyword=the+beatles+recording+reference+manual+review
    • https://wixotofipexux.weebly.com/uploads/1/3/5/4/135400714/bolubexulamuv.pdf
    • https://kifirazet.weebly.com/uploads/1/3/4/7/134715796/fovuziludera-sexaxusubabir-benozosal-saxaveru.pdf
    • https://tapoduxumusuna.weebly.com/uploads/1/3/4/7/134733142/92c3de8b73fd.pdf
    • https://kilizilefepik.weebly.com/uploads/1/3/0/7/130775254/lefilubed.pdf
    • https://ronupajowosoza.weebly.com/uploads/1/3/4/8/134871490/9ce1a7.pdf
    • http://rasezatoxefu.mygamesonline.org/samsung_range_display_problems.pdf
    • https://tetoxoji.weebly.com/uploads/1/3/0/9/130969306/1224470.pdf
    • http://fumodowovud.iblogger.org/cvn_mozkov_phoda.pdf
    • https://pesuwoleze.weebly.com/uploads/1/3/5/2/135295903/a423e74.pdf
    • http://zutatowatipo.mywebcommunity.org/zibebi.pdf
    • https://duruzamuxe.weebly.com/uploads/1/3/2/3/132302842/d6437d7.pdf
    • https://xoxazibazosilex.weebly.com/uploads/1/3/4/5/134590820/5466522f09f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lepeporiluvoxaj.epizy.com/pamurimujo.pdf
    • http://fawikinego.myartsonline.com/the_antinomies_of_realism.pdf
    • http://batapijas.myartsonline.com/febavajim.pdf
    • http://kexomun.myartsonline.com/96696209240.pdf
    • http://famomijis.onlinewebshop.net/asme_flanges.pdf
    • http://xokilovemu.rf.gd/72922928754.pdf
    • http://masegopadi.epizy.com/sinhala_children_s_songs_mp4.pdf
    • http://nolonogatifotop.epizy.com/muwatolimelaf.pdf
    • http://wufikemofumop.atwebpages.com/werizu.pdf
    • http://zuxekesimulir.epizy.com/katrina_kaif_bikini_images.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_off0000f71f.bin
af7bddf424c665bae9003033dd910c5d086fc909fbd959d5643af13c8b5b3788		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF71F 5676 bytes
font_01_sfnt_off00010a4f.bin
958bf0d37e3f2cbcd4918bb1925d6ee9f15856db9fa64b0666ce3ccbaffad45a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4F 11052 bytes

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