Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef835778cac1209…

MALICIOUS

PDF

78.1 KB Created: 2021-06-09 10:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6b3c9302be1df61c2f5441d7486b7e58 SHA-1: 91f0b952aed8aaf9703a045eed0bf0df1eb9cac4 SHA-256: 7ef835778cac1209306251fe4295470206c8efbea8af5b7fd78e38a30343985c
126 Risk Score

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 0.9990

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://ketchas.ru/pbw?utm_term=convert+rofl+file+to+mp4 PDF link annotation
    • https://firerokuk.weebly.com/uploads/1/3/1/1/131164187/e45f02322207469.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460247/normal_605b79368db05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495055/normal_6069f207bca7c.pdfIn PDF document text
    • https://tusefekojeseto.weebly.com/uploads/1/3/4/4/134437698/vedefakafimijo_tasugomezusabo_dodowetodizaba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366956/normal_604de4017de50.pdfIn PDF document text
    • https://fozixaxo.weebly.com/uploads/1/3/4/6/134665632/a3e77da7bab98b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481988/normal_6022653e03859.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366341/normal_5fff7ef8a3517.pdfIn PDF document text
    • https://juregirezixo.weebly.com/uploads/1/3/4/4/134401856/viregakedimi-polev-leguxen.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4424010/normal_60b621977e83b.pdfIn PDF document text
    • https://kisofoga.weebly.com/uploads/1/3/1/3/131383553/towaxaxajo.pdfIn PDF document text
    • https://sozivaxuzafuzi.weebly.com/uploads/1/3/1/8/131856435/2521598.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485946/normal_602ae90f97518.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369487/normal_6047a92578b71.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4417226/normal_60b26cc607e15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424982/normal_601c86c52365d.pdfIn PDF document text
    • https://butusokusumowa.weebly.com/uploads/1/3/5/2/135294155/fe36109e38acc1.pdfIn PDF document text
    • https://loneluripovulom.weebly.com/uploads/1/3/4/3/134364014/ffac184b67.pdfIn PDF document text
    • https://kitorulefif.weebly.com/uploads/1/3/4/3/134331375/7353242.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://fudejob.pbworks.com/f/tovonudilikilodonadexazok.pdfIn PDF document text
    • http://zusemivak.pbworks.com/f/mekiresomobobivorolerakom.pdfIn PDF document text
    • http://ronejoxerer.pbworks.com/f/heavy_bus_mod.pdfIn PDF document text
    • http://gibabug.pbworks.com/f/16893355232.pdfIn PDF document text
    • http://gogoporiwo.pbworks.com/f/dedham_public_library_phone_number.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE924 4616 bytes
SHA-256: b23f28209faa83caa7080c367d12aaf9d5d3cae5ca2310dfde6e62f41549b688
font_01_sfnt_off0000f8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C3 10488 bytes
SHA-256: 6e0ad695486316e92bde794446475c154d2cbce2d67a47373d621bc43c033b22
font_02_sfnt_off00011c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C79 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c