Malicious PDF — malware analysis report

Static analysis result for SHA-256 d867cc883be91004…

MALICIOUS

PDF

75.9 KB Created: 2020-11-18 01:14:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 5ca8ef229c13dc2520c979de38c00833 SHA-1: e0343e288add929c5d83accce3a25c270c690a73 SHA-256: d867cc883be910049804ae1fa9b229bf51ef58fdfe4b229b930ea776e7a51abd
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded content, though heavily obfuscated, indicates the file's primary purpose is to redirect users to potentially harmful external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffine.ru/123?utm_term=.4375+into+a+fraction PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365601/normal_5f882f865828c.pdfIn PDF document text
    • https://vefaruturibil.weebly.com/uploads/1/3/4/5/134525254/ramoxik_sofixawa_botomezokibon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367648/normal_5f8779f483022.pdfIn PDF document text
    • https://laxigozi.weebly.com/uploads/1/3/4/3/134361341/bixitoboturax.pdfIn PDF document text
    • https://vebusigatibata.weebly.com/uploads/1/3/4/3/134321359/zomisubawonulabaka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372104/normal_5f8b4bd47011c.pdfIn PDF document text
    • https://xinifusat.weebly.com/uploads/1/3/4/3/134321574/nawetikodujazuzubus.pdfIn PDF document text
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/lusilataviludova.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366633/normal_5fb451b06564b.pdfIn PDF document text
    • https://sikupawabur.weebly.com/uploads/1/3/4/6/134624396/xadewon.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
    • https://uploads.strikinglycdn.com/files/f4e8b697-5f03-4619-992d-26f8ef6f05b3/picasa_latest_version_official_website.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/66631101062.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/aashto_t275.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d79268bb-3b77-4cb3-a9e9-76a4e23ed4e3/watabo.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000fab3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFAB3 17360 bytes
SHA-256: efc7c6516ca8b5d5f720c82d161d15600f7c63c2e923fb3a065759a8de2d95da
font_00_sfnt_off0000c802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC802 4728 bytes
SHA-256: f86a8eeba0146ab6f3abb60674e9e72d960ff22245bedd228fe94f937227c72f
font_01_sfnt_off0000d822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD822 10044 bytes
SHA-256: 1f9b2eadb500a841413c1e94cf7ffe9e08ca12efbd987ccf3bded38a82bce8b1
font_03_sfnt_off00011477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11477 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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