Malicious PDF — malware analysis report

Static analysis result for SHA-256 518b0d626b2f6840…

MALICIOUS

PDF

75.3 KB Created: 2021-03-23 12:50:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ceb649d5d6ba394c67749550d847ebb8 SHA-1: b36fb5ac8fd02e477e50743bb9ae1b4935c5b8ae SHA-256: 518b0d626b2f6840f57adea5706aeca1ae226971fd6e80dcd8c52c3178322b29
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://crophysi.ru/award?keyword=church+leadership+styles+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446285/normal_603e956f830fd.pdfIn PDF document text
    • https://tiluzapibijodok.weebly.com/uploads/1/3/4/2/134265907/1b05c7e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388627/normal_60112c216fda8.pdfIn PDF document text
    • https://pubodepilup.weebly.com/uploads/1/3/1/4/131406337/9033949.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/hhHjg7v/83048469377.pdfIn PDF document text
    • http://rerixen.scienceontheweb.net/asus_rt-n66u_password_reset.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474977/normal_605814a52f09e.pdfIn PDF document text
    • https://gixoxiri.weebly.com/uploads/1/3/4/7/134707295/7316786.pdfIn PDF document text
    • http://wusokamojifel.scienceontheweb.net/direccin_de_sanidad_polica_nacional.pdfIn PDF document text
    • https://ropoluwuxonixol.weebly.com/uploads/1/3/4/6/134692090/2895851.pdfIn PDF document text
    • https://cdn.sqhk.co/veleviziwew/eghggji/chicken_invaders_5_full_version_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/movumatoz/4vrgjgh/zogosus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374843/normal_5fc7456b3ab8b.pdfIn PDF document text
    • https://cdn.sqhk.co/bopibege/e7iaiLL/potara.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/Mmhagcw/crossword_mysteries_cast_abracadaver.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a52d8381-4bd8-4137-9461-46de371a4ded/kenmore_upright_freezer_model_253_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76b245ad-f128-4751-a05d-ba2cce05deaa/monokubofirejeroxaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/813b9d68-2530-427a-83ad-580d19bb3427/57453460360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e6abea2-eeeb-4034-86ed-d09545f72d8c/41874881326.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc28d901-668b-41ca-a9cd-33af9702b64f/78491905551.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_off0000eb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB70 5248 bytes
SHA-256: 6396ec77ebfbc99767da17050052009e2db2d91904557ffdb4aafb2133bf7ee8
font_01_sfnt_off0000fd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD49 10188 bytes
SHA-256: 8b7c6c873e804568ecd6bbb942771a5f6d4a810ec5052af45d1402b8fa316f56

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