Malicious PDF — malware analysis report

Static analysis result for SHA-256 670cfbf3ddf569bf…

MALICIOUS

PDF

77.8 KB Created: 2021-01-11 02:55:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 44c9182e995f07d8e55361d509616a51 SHA-1: e9050e4503f604744337e1909829effb2e7ae78c SHA-256: 670cfbf3ddf569bffb49a21bfbe47615fbfd0ad2ff038f81cdce355c6b673c6d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

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://trafficel.ru/123?utm_term=chapter+8+test+answers PDF link annotation
    • https://cdn.sqhk.co/zovifesojeme/Midiigi/81566242646.pdfIn PDF document text
    • https://site-1168173.mozfiles.com/files/1168173/leon_s_kennedy_resident_evil_4_wallpaper.pdfIn PDF document text
    • https://site-1226658.mozfiles.com/files/1226658/gepiwafenoxugujuperomitad.pdfIn PDF document text
    • https://site-1174826.mozfiles.com/files/1174826/67146117832.pdfIn PDF document text
    • https://zuwukozoxuwiged.weebly.com/uploads/1/3/4/7/134713444/fefupalazulas-kuxudel-xumis.pdfIn PDF document text
    • https://site-1168066.mozfiles.com/files/1168066/flaming_lips_artwork.pdfIn PDF document text
    • https://site-1201825.mozfiles.com/files/1201825/bowijizadopezenim.pdfIn PDF document text
    • https://site-1168056.mozfiles.com/files/1168056/44843696155.pdfIn PDF document text
    • https://site-1177426.mozfiles.com/files/1177426/basketball_3d_play_dunk_shots.pdfIn PDF document text
    • https://sivajusirev.weebly.com/uploads/1/3/0/8/130814673/dagetemiru_rafofele_tozagegefed_rudijupaj.pdfIn PDF document text
    • https://site-1177476.mozfiles.com/files/1177476/31707769574.pdfIn PDF document text
    • https://site-1174034.mozfiles.com/files/1174034/ruwezasedibogoro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/zowibatev/albion_online_reddit_guide.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://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD651 5068 bytes
SHA-256: f5a7fb403c140a307a7244e61fc5701025cb72ae7757e0ca0103ffa937462294
font_01_sfnt_off0000e787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE787 10988 bytes
SHA-256: 0b37d15f8c9b256e6a1b4a14cc79246c3736ca754bfc014a5b54afebd028e014
font_02_sfnt_off00010645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10645 10552 bytes
SHA-256: bddec022e29a538463c8098f63c61fdb469ee32ad2d597395344867fd8104400

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