Malicious PDF — malware analysis report

Static analysis result for SHA-256 01600f0512957383…

MALICIOUS

PDF

82.3 KB Created: 2021-03-29 07:39:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 3ac374ca4bbb9f2e9de2b268dd7a9825 SHA-1: 7c07c81455ba099d9735e975464b4d5ee693fbbc SHA-256: 01600f0512957383d4c616b25e63a7afc0a59509549c296656b3fbcca1ddbcd5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm designed to manipulate search engine results or distribute other malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs point to various PDF files hosted on external domains, which could serve as lures or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/wix?keyword=kitchen+staff+training+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418796/normal_5fe7e884e200e.pdfIn PDF document text
    • https://sodipojemip.weebly.com/uploads/1/3/5/3/135325099/1061604.pdfIn PDF document text
    • http://cheapkeys.site/msi_970_gaming_manual_download8p4oz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448129/normal_60031fc715ebf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417818/normal_601b65bc8be2a.pdfIn PDF document text
    • https://leponinidokawe.weebly.com/uploads/1/3/4/5/134502666/xawobanuvedizotebi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472494/normal_602099067c91e.pdfIn PDF document text
    • https://vonekinorosasox.weebly.com/uploads/1/3/4/7/134732286/belejix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376866/normal_604f8eecde60c.pdfIn PDF document text
    • http://futup.ru/tuwalagapex18kdg.pdfIn PDF document text
    • https://kitaterikobojim.weebly.com/uploads/1/3/0/9/130969176/9665335.pdfIn PDF document text
    • https://dusonomikeka.weebly.com/uploads/1/3/2/6/132695238/2ba7958901.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_0d2fa64c0d9842d7a2baa61d204828f6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/bal_ganesh_images_hd_wallpapers.pdfIn PDF document text
    • https://673fcb93-492a-40d1-a7cc-77260b5c7816.filesusr.com/ugd/62d21a_e095dff3fa7247b3806d7c5cf0bf4859.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/12104187971.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/the_vegetarian_flavour_bible.pdfIn PDF document text
    • https://29ce6865-365c-47c4-9f0a-635d6f965865.filesusr.com/ugd/0d6b77_073ecf0c081941e1be094d82c1489b08.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_off00010380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10380 5536 bytes
SHA-256: 898aaf1c62f2828079c9e7a25f03a52f43d01c794935310963c2c76f2dad421b
font_01_sfnt_off00011636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11636 10764 bytes
SHA-256: 95b3dc46b553d9c014d31be1ef86d8ac55befb081615c06f43b4ed4dd0075479

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