Malicious PDF — malware analysis report

Static analysis result for SHA-256 190d0634d8cf4a33…

MALICIOUS

PDF

69.6 KB Created: 2021-02-28 03:26:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: b6879510b3f2cf7000368a55375266e8 SHA-1: 3dbfc226236e54bb39891634313965742eea9575 SHA-256: 190d0634d8cf4a338220d8580566cc78b4b0730bdabf225b5f7e287c28c7ebb4
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL suggesting a lure related to 'business analytics salary'. The presence of external URIs and the overall structure indicate an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

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://maypoin.ru/award?keyword=business+analytics+salary PDF link annotation
    • http://astrology-personal.online/orchestra_video_mp4m45mk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449783/normal_5fe23056a09a4.pdfIn PDF document text
    • https://cdn.sqhk.co/tisufupujeli/eme1vnY/steamboat_springs_colorado_map.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwojosop/0feheOc/db_super_free_wallpaper_hd_4k.pdfIn PDF document text
    • https://sogifeni.weebly.com/uploads/1/3/2/7/132712483/6678700.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470405/normal_600c203598d4f.pdfIn PDF document text
    • http://bristol-yalta.run/wenifezafodidark8069.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454575/normal_5fe74a8cbd5aa.pdfIn PDF document text
    • https://cdn.sqhk.co/luwokiseg/b5eieJQ/71674207626.pdfIn PDF document text
    • http://small-italy.space/mamisolutisoroponurivzyc.pdfIn PDF document text
    • http://topdiscount.pro/juwopurukeramipovejapcp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422643/normal_5fcabaa99fdb0.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/luramamelolem/37446293296.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_off0000d4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A6 4944 bytes
SHA-256: 24fec11389ccdd720bba3764086a5c5878ed4cc3199ead4c45728f6e84316fa2
font_01_sfnt_off0000e590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE590 10720 bytes
SHA-256: a9a98f904756a7bb0cb7f28a71b30e92d9bee235b82e4db8d3fdb5754f10f018

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