Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a921f1e1d31a68…

MALICIOUS

PDF

107.1 KB Created: 2021-02-06 19:23:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 982aba1b64178c2691cfb553bd0ee16d SHA-1: ce3a854b655297b1df391ca241caf48c78a83d45 SHA-256: 79a921f1e1d31a68f14a239865e694ceb06c3e8183757e1913280a7d865a581b
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 0.9997

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://jottigo.ru/aws?utm_term=aminoglucosidos+pdf+2017 PDF link annotation
    • https://disebaxixifos.weebly.com/uploads/1/3/4/7/134714932/vufusifopabo.pdfIn PDF document text
    • https://cdn.sqhk.co/murofoli/ienibib/university_of_montana_bookstore.pdfIn PDF document text
    • http://doxugivo.22web.org/73291817879.pdfIn PDF document text
    • https://digavonuvuveg.weebly.com/uploads/1/3/4/8/134851043/galavajopa-gupavazok-zubezib-nivavulixix.pdfIn PDF document text
    • https://cdn.sqhk.co/fivufotimad/YAgfmic/88582093373.pdfIn PDF document text
    • https://cdn.sqhk.co/dujagazatad/ojfJDia/78098957492.pdfIn PDF document text
    • https://gavemipaxok.weebly.com/uploads/1/3/2/6/132680822/4324886.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454049/normal_5fe90f879639e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372104/normal_60017ddb5ec4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378171/normal_5fcf0b32d9fbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379049/normal_601aaa3bef043.pdfIn PDF document text
    • https://feposejixadolo.weebly.com/uploads/1/3/4/7/134744373/benefoj.pdfIn PDF document text
    • https://xizirasifeda.weebly.com/uploads/1/3/4/3/134344010/bawisuxet_pabutebari.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420602/normal_5fdddb83a48da.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xedovafimolodem.epizy.com/kujonilokiruk.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14128 5248 bytes
SHA-256: 6dd1cce547cc09dc0c541e0d07fea89322baf3855913e2c9b662bf10bd4f159c
font_01_sfnt_off000152f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152F7 12344 bytes
SHA-256: 5646bf648757dbd1ee6df678c8fdac6f3537fffc000ad67a9229cff8c8f767aa
font_02_sfnt_off00017a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A85 16152 bytes
SHA-256: c734b767e73690fef67d91cc9656eecacb3a390be5c8d270e1d6fbb742835413
font_03_sfnt_off00018f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F77 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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