Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9bb2f7fac04f56e…

MALICIOUS

PDF

70.2 KB Created: 2021-06-03 12:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5b82406b48abd405d4ac2f4b7854b1d8 SHA-1: de2ff5ed9f01995c84b71faa0f666d8ca1e778e1 SHA-256: a9bb2f7fac04f56efdd1855be373155af4aa3c77ea50268156c79d0dea8d248a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9998

Heuristics 5

  • 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://archism.ru/pbw?utm_term=how+to+work+a+hamilton+beach+microwave PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371020/normal_6056e2b934f34.pdfIn PDF document text
    • https://lotuliwupufak.weebly.com/uploads/1/3/4/8/134873452/1605827c.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4489264/normal_60b59055954f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457000/normal_6046b86125169.pdfIn PDF document text
    • https://xoburorabusu.weebly.com/uploads/1/3/0/7/130738623/wuwigotogibe.pdfIn PDF document text
    • https://kogojovuxerew.weebly.com/uploads/1/3/4/8/134882843/2448526.pdfIn PDF document text
    • https://pasudavekeri.weebly.com/uploads/1/3/1/4/131437626/nudavidaxazo.pdfIn PDF document text
    • https://pojutawetuje.weebly.com/uploads/1/3/1/3/131382470/4e87f1f73f1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vulazojab.pbworks.com/w/file/fetch/144547371/95841482902.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/w/file/fetch/144411396/gexibewuzudofijuxob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f95bcbeb-184a-4b24-85a2-3ffb6cd0c1f3/bible_chronology_old_testament.pdfIn PDF document text
    • http://jolowajuwijo.pbworks.com/w/file/fetch/144521820/lfs_unlocker_download_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c081db5-6d16-4a60-a99f-e46e4b7df4ef/fusegusapiver.pdfIn PDF document text
    • http://vajaxasave.pbworks.com/w/file/fetch/144472791/55877641852.pdfIn PDF document text
    • http://natofuke.pbworks.com/w/file/fetch/144554142/ikea_slattum_bed_frame_assembly_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14dec29e-ad99-48b7-8f69-d9ed3f8af357/xubamifofufe.pdfIn PDF document text
    • http://tekitejug.pbworks.com/f/42809327320.pdfIn PDF document text
    • http://zowonixepor.pbworks.com/w/file/fetch/144461361/gb_whatsapp_pro_v8.75_download.pdfIn PDF document text
    • http://wimarolos.pbworks.com/w/file/fetch/144510426/sakajuwamipelawofa.pdfIn PDF document text
    • http://kiletejude.pbworks.com/f/tebawu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD575 5180 bytes
SHA-256: cb6daf24a7446e21037e7bb144867742b410366c41209c65b8b9ae6851a32dd2
font_01_sfnt_off0000e6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FF 10688 bytes
SHA-256: 38537b69962967a1e2b3f38d40871b7e634a56741ead44449bc8429fb6e602ba

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