Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba17200383b5c372…

MALICIOUS

PDF

78.8 KB Created: 2021-03-31 07:41:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7cbbb58f5c767e89adaab592adb60614 SHA-1: 2cca28eea8410ea38fd82d55ccbaa948308b8537 SHA-256: ba17200383b5c37236b9cbb508a77649a2b76a16521137d5a1ee07f08bfd443b
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many pointing to domains associated with link farms or potentially malicious content. The presence of external URIs and a link farm heuristic suggests an attempt to redirect users to malicious websites, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://botokaw.ru/123?utm_term=charmed+episode+guide+season+4
    • https://cdn.sqhk.co/puvubuzu/gcHfgcC/winibawozibupa.pdf
    • https://cdn.sqhk.co/xewafazuk/c0B34fq/boxasaxupupujikigu.pdf
    • https://ritesevegozuvij.weebly.com/uploads/1/3/1/6/131606822/d50d24305059.pdf
    • https://cdn.sqhk.co/dukosisevu/cid5Ehg/nidomej.pdf
    • https://cdn.sqhk.co/pibilebomek/hihegSV/blue_light_glasses_for_kids_amazon.pdf
    • http://nakozek.mypressonline.com/39517398036.pdf
    • https://nugubigu.weebly.com/uploads/1/3/5/3/135323865/28cb82620.pdf
    • https://pudavupotel.weebly.com/uploads/1/3/5/3/135335197/jupizinadepofumaro.pdf
    • https://burakatotofok.weebly.com/uploads/1/3/1/8/131871829/barebebul.pdf
    • https://cdn.sqhk.co/muligumixe/ehfifja/91265140725.pdf
    • https://vakurizilobiwil.weebly.com/uploads/1/3/0/9/130969742/pemofeveg.pdf
    • https://bawufavipefal.weebly.com/uploads/1/3/0/7/130740211/c15db86c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9bc41b86-2c62-42fe-86ac-a6f25adbd037/android_development_tools_adt_plugin_for_eclipse.pdf
    • https://uploads.strikinglycdn.com/files/cc53d774-9c42-4abc-a157-6379d2d434d8/2717794985.pdf
    • http://mivurukelino.onlinewebshop.net/understanding_and_using_english_grammar_chartbook_a_reference_grammar.pdf
    • https://uploads.strikinglycdn.com/files/65bc4ea5-1c1a-4261-9870-107bb677c4f1/65605267230.pdf
    • http://bowegasobufur.myartsonline.com/58317421191.pdf
    • https://7a48fde5-f9d1-4ce4-84a2-8b156d245d18.filesusr.com/ugd/8127dd_6ba5e1a227df42d8b52727bcb60a4b61.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fc1b0a2c-7fb6-43a2-a7aa-2f282fac68dc/basic_health_and_safety_training_for_employees.pdf
    • https://4f6c49ad-35c2-4e1b-a50e-a4ca4816ee30.filesusr.com/ugd/a28dad_be536f14bcdf420ca1271edde53be4f4.pdf?index=true
    • http://sinusisokopex.atwebpages.com/jepudezu.pdf
    • https://79d86aa2-23c4-4aa0-a0dc-c16ac59ae55d.filesusr.com/ugd/ecb701_8a417a045f904598ba4c75fb0b52e881.pdf?index=true
    • https://3a0d5408-2ea1-4258-8d29-5d96341cad2c.filesusr.com/ugd/79cb75_faba0c9fa1ff41d886a8b719ddb5ecd3.pdf?index=true
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_264423213f524b7b9d27be9e171ec59c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d53138c9-c567-4e4c-932c-a5b3ab2e6706/clinical_microbiology_made_ridiculously_simple.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_off0000f484.bin
561e9bffbb853e21e204c1cf073b1484fa9c73645680ad803ee9d72c112a4abb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF484 5336 bytes
font_01_sfnt_off0001067f.bin
1e2b0e561e34fa12740a48d0221526e6338a9923ccd5e1a27bc89733323b43ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1067F 11576 bytes

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