Malicious PDF — malware analysis report

Static analysis result for SHA-256 138d257bc3bfac75…

MALICIOUS

PDF

112.9 KB Created: 2021-03-19 22:19:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 360358a63c2dde18124292740fefb290 SHA-1: 3085f39210e76b3bb6c95457eb683b96793f4363 SHA-256: 138d257bc3bfac753b32d9e9003818288abb32a6aacda6cd992f9321fd18b062
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 0.9998

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://dafemum.ru/123?utm_term=bayer+ag+annual+report+2015 PDF link annotation
    • https://cdn.sqhk.co/bomumuxa/idgiRgi/liwafewilasekutidob.pdfIn PDF document text
    • http://shop-you.xyz/stihl_chainsaw_model_025_parts_diagramlmxf6.pdfIn PDF document text
    • http://iglivesupportteam.com/2008_ford_mustang_shelby_gt500_0-60wvhuz.pdfIn PDF document text
    • https://cdn.sqhk.co/rutisifelom/8GObBgc/80191089726.pdfIn PDF document text
    • http://sqrab.top/23165262068howww.pdfIn PDF document text
    • http://manthoughtswebsite.website/koduxorineretabixbo1q.pdfIn PDF document text
    • http://lulilafemavivog.mygamesonline.org/ruvedixozel.pdfIn PDF document text
    • http://vibijinit.scienceontheweb.net/37195365632.pdfIn PDF document text
    • https://cdn.sqhk.co/vumulevezuf/boQB2ic/26495733359.pdfIn PDF document text
    • http://menformula.xyz/sophia_fowler_gallaudetvuh0s.pdfIn PDF document text
    • http://bitsracing.net/befixuvoxutesafu6q747.pdfIn PDF document text
    • http://kufejat.sportsontheweb.net/makalah_kebutuhan_dasar_manusia.pdfIn PDF document text
    • http://forajadafogaxuv.medianewsonline.com/1072803838.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_3ebbc60864674c6ab9448d32ee83676d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/line_algorithm_in_computer_graphics.pdfIn PDF document text
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_da229453032d410fb7b90057ce921e2e.pdf?index=trueIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_ec47ed0a21c343388be40881ad54ad71.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/3673880761.pdfIn PDF document text
    • http://vigavanoxe.onlinewebshop.net/ziwivufuwuravuz.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15286 6984 bytes
SHA-256: 4339e16230a3637fe1525bd6b39b6f7b53310c3c76e6fb176d2ac5a9f72999cc
font_01_sfnt_off00016a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A20 5412 bytes
SHA-256: 32350632f954a3c32f9da8f1794374e51c3816d948d02c64955595312bb0773a
font_02_sfnt_off00017cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CAB 18032 bytes
SHA-256: 0af107e8be1d777d1f15c254ee7c1450071dea80dc70fc57d416f45046bb2d6c

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