Malicious PDF — malware analysis report

Static analysis result for SHA-256 b482198217825799…

MALICIOUS

PDF

81.8 KB Created: 2021-01-15 11:26:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c9657ec95274e03b48dceb0f9d483304 SHA-1: e93bfbc5052700afb9ba1e6c81981e53ff189a6e SHA-256: b48219821782579946897288c45df4a52876a65d3e572c7f41a6802d65fa4b0e
126 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains and utilizing UTM parameters, suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', hinting at its generation method, and the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffnew.ru/123?utm_term=speech+main+idea PDF link annotation
    • https://xuniruki.weebly.com/uploads/1/3/0/7/130739043/migefajuwaf_muxodebapozi.pdfIn PDF document text
    • https://site-1166621.mozfiles.com/files/1166621/ice_cream_sandwich_comics_youtube.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381294/normal_5f9c0988df53e.pdfIn PDF document text
    • https://site-1172650.mozfiles.com/files/1172650/hd_video_player_windows.pdfIn PDF document text
    • https://site-1214372.mozfiles.com/files/1214372/20294689124.pdfIn PDF document text
    • https://site-1176609.mozfiles.com/files/1176609/mijevibewolilele.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483331/normal_5fb6bc3a98bcf.pdfIn PDF document text
    • https://site-1168299.mozfiles.com/files/1168299/download_battlehand_heroes_mod_apk.pdfIn PDF document text
    • https://site-1225452.mozfiles.com/files/1225452/gcse_maths_scatter_graphs_worksheet.pdfIn PDF document text
    • https://site-1171371.mozfiles.com/files/1171371/vejetafodak.pdfIn PDF document text
    • https://worijuxadije.weebly.com/uploads/1/3/4/8/134863955/lepubewuzu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416669/normal_5f9600ce5409e.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/desenaz/60219156270.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/sujobam.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE48 5112 bytes
SHA-256: 4c4252749d9915e32f903699c6f2e6ed2da8a8da4d38ac3a27667337eeb22388
font_01_sfnt_off0000ff87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF87 10940 bytes
SHA-256: a05e13de15f26d91779003babd83d013432ec828c942e26c02bf845e4b6aa018
font_02_sfnt_off000124e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E5 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf

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