Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a887e4638b4b980…

MALICIOUS

PDF

79.7 KB Created: 2021-01-16 22:40:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 19e089efe072d5290ec496a1aef86acd SHA-1: 909e9e2991142c3612b1af603f7f78b2f00cec9d SHA-256: 9a887e4638b4b98057645cdaae20c2f4d96e3675605e27e97577a2a3f7dd95b4
104 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The presence of a visual download button lure, combined with an external URI pointing to a suspicious domain, suggests the document is designed to trick users into downloading further malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct textual clues about the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=ariana+grande+-+touch+it+%2528sad+version+mp3+download%2529 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411916/normal_5fa0a72a3167c.pdfIn PDF document text
    • https://site-1178057.mozfiles.com/files/1178057/dixojitidelenaroronexawit.pdfIn PDF document text
    • https://cdn.sqhk.co/fawabanof/TPMpyq4/vr_zombie_shooter_london.pdfIn PDF document text
    • https://site-1168447.mozfiles.com/files/1168447/train_to_busan_2_movie_free.pdfIn PDF document text
    • https://site-1246938.mozfiles.com/files/1246938/50031161052.pdfIn PDF document text
    • https://site-1168218.mozfiles.com/files/1168218/27918712456.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479439/normal_5fb6ecfd9a64e.pdfIn PDF document text
    • https://site-1175466.mozfiles.com/files/1175466/pikikoja.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/fewifuwu/81494652916.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/kevafirugokek.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/service_electric_cable_channel_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/condyloma_acuminatum_treatment_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/caller_name_apps_for_android.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD667 5980 bytes
SHA-256: a45df18fe6aab1ef2d21a900a933770b0a1287fef68b26179594b4379c714acf
font_01_sfnt_off0000eabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABF 1872 bytes
SHA-256: 0bb2955b5ca913a863097ea77f419106b897578fd6324294087ea51a982d7a63
font_02_sfnt_off0000f3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AF 10948 bytes
SHA-256: c67df7c74619fce2b0ea44f0a9683cb4885529c97226c5b26d665274492b206b
font_03_sfnt_off0001193b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193B 16204 bytes
SHA-256: 48aff817bde83783653ef2c2e952d5b04229e9ab14dea8968ba0602ff0718588

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