Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39cb6867c8043f5…

MALICIOUS

PDF

64.5 KB Created: 2020-12-15 20:08:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c05db6f2c1041474de3da739b3834071 SHA-1: 7be7e566f5d4bae458f74f9a318c258288c62813 SHA-256: d39cb6867c8043f550324cefa1462f5e4727b2fccb7d90dc10c72ea238d94173
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a large number of external links, some of which are presented as a download button. The presence of multiple unknown URLs suggests a potential phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/aws?utm_term=times+of+india+epaper+pdf+free
    • https://static.s123-cdn-static.com/uploads/4404112/normal_5fc47d91a3afc.pdf
    • https://folarudivol.weebly.com/uploads/1/3/1/8/131871739/larum.pdf
    • https://jotinebemoti.weebly.com/uploads/1/3/4/6/134681432/lixemudov.pdf
    • https://jafazoragi.weebly.com/uploads/1/3/4/7/134769717/3083002.pdf
    • https://cdn-cms.f-static.net/uploads/4413112/normal_5f94650091fd9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zarelusipofox/batiresexedi.pdf
    • https://static1.squarespace.com/static/5fc5597d40f1034a5cc674bd/t/5fd64424df2f0204c2322036/1607877669753/ireport_cannot_find_java_exe_neither.pdf
    • https://s3.amazonaws.com/dowesitobuga/android_terraria_1._2._6787.pdf
    • https://s3.amazonaws.com/gumagabu/play_minecraft_online_apk.pdf
    • https://s3.amazonaws.com/fasanag/matuxabu.pdf
    • https://s3.amazonaws.com/nakevoja/when_is_the_next_twitchcon_2020.pdf
    • https://s3.amazonaws.com/varolexexus/cambridge_dictionary_app_for_android_free.pdf
    • https://s3.amazonaws.com/henghuili-files2/zopapeka.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf58eb3c02f22b9d047107/1606375660254/kayak_sun_shade_for_dogs.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bffe.bin
3902cd907d2d080ed0a7402657fc917c722f22279f1cbbe9cb6a9781a2fc2136		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFE 5104 bytes
font_01_sfnt_off0000d140.bin
7d1e6e53b48763f8556b515170d8e1f9648aa7f1c2d71d65a9aa7da60b4f63d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD140 10512 bytes

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