Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f58315b03ad5fe…

MALICIOUS

PDF

70.9 KB Created: 2021-01-11 08:43:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 2e0dfefb93343a11d0226de0624b3c8f SHA-1: 2d8ec9050098566389cc28fe47ab7ebf0f4c1aff SHA-256: f6f58315b03ad5fe5b8273094ab6be53f9b45428bb9424065b1f81ac3509b19b
146 Risk Score

Malware Insights

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

The PDF contains a malformed exploit stream and is flagged by ML classifiers and ClamAV as malicious. It also exhibits characteristics of a link farm on disposable hosting, with numerous embedded URLs pointing to potentially malicious content. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, suggests an attempt to execute malicious code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://trafficel.ru/aws?utm_term=bleacher+report+nba+draft+rankings PDF link annotation
    • https://site-1174866.mozfiles.com/files/1174866/duck_hunting_season_mn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498992/normal_5fd1eacc92038.pdfIn PDF document text
    • https://wakevilapiz.weebly.com/uploads/1/3/4/9/134903367/katimidabobini.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421333/normal_5fd832d366bfb.pdfIn PDF document text
    • https://vimexizud.weebly.com/uploads/1/3/4/7/134755563/janumesa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459170/normal_5fbc886329575.pdfIn PDF document text
    • https://site-1171149.mozfiles.com/files/1171149/52394426492.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391915/normal_5fe0bb90a4ec6.pdfIn PDF document text
    • https://rifonaro.weebly.com/uploads/1/3/4/6/134679964/kafifutubepited-wafezabiwusaje-bozugujowubu-baxawopulejoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455658/normal_5ffbc67318b61.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/gajilukudufededef.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/vadepokivemoromijoxowede.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_off0000d895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD895 5672 bytes
SHA-256: 94a89d4caff26ee24c491fc0cf17f0a3df579ef010eaa84452ccccdfcbac4700
font_01_sfnt_off0000ebdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDB 10180 bytes
SHA-256: b0e0131cdef13fcbdcc57e1371b77179b3d6420e1b307aa3c8235135c7eca5e1

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