Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d4788c864869c1…

MALICIOUS

PDF

112.8 KB Created: 2020-11-28 21:09:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a3a6e50ab6b3c87c13ff7aedf05f6d45 SHA-1: 7100020036bbfefe08238dac190d09c43dff9fac SHA-256: 88d4788c864869c1c3abe2a8b3b46ae58ffe27f92d59304a2036d75f16eaacc1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable hosting services, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a title that could be a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://trafftec.ru/aws?utm_term=table+du+code+ascii+pdf PDF link annotation
    • https://nipaxibovaj.weebly.com/uploads/1/3/1/3/131379211/7394129.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465257/normal_5fac1ec2eb146.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451049/normal_5fa0a59d198d0.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/7805117.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387817/normal_5fbc9d25add0f.pdfIn PDF document text
    • https://lotagixowila.weebly.com/uploads/1/3/1/1/131164100/8100678.pdfIn PDF document text
    • https://kowonuzadanovit.weebly.com/uploads/1/3/4/6/134686130/jerisusimuxaf-bixulajivajoruj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368975/normal_5fb820fd431e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387711/normal_5f9f592fb8010.pdfIn PDF document text
    • https://fekazivijiwawad.weebly.com/uploads/1/3/4/6/134687088/8988390.pdfIn PDF document text
    • https://pujatimosu.weebly.com/uploads/1/3/2/6/132681823/lijenavobu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422645/normal_5fb3cd936cc48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370068/normal_5f938810a515e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/davubewu/cheat_cafeland_android_apk.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10298 5144 bytes
SHA-256: e40ae96416ba30dc41d28e9546a2f1dbf7118c31dd00ab48e2a204980ab2d6e5
font_01_sfnt_off00011420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11420 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off00011f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F83 30528 bytes
SHA-256: a7f59f372a0043517eb31590c45254d5f50c3577b9c3d1f3605250784c971624
font_03_sfnt_off00017023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17023 16140 bytes
SHA-256: 159427b32ed66bfbde86def5e6c2992bde67dfb25400c4000a37c9b59b949b61
font_04_sfnt_off0001855c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1855C 15584 bytes
SHA-256: f66cf2be3d3b88af94678cdff00c6172cb2f08c5e92a09b06e36014556da7872

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