Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ddfc4ecdc7f175…

MALICIOUS

PDF

70.6 KB Created: 2021-01-24 12:15:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 0d3e474773b497042a4d8e245bf06486 SHA-1: 714130fba1b3234a12a49bb7f2454733536ff1b4 SHA-256: 39ddfc4ecdc7f175b489d607fce984666f26788e5ca13687da05d82bf637c78a
126 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable domains, many of which are disguised as download links for various software or content, including 'piano sheet music'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/aws?utm_term=omae+wa+mou+piano+sheet+music PDF link annotation
    • http://shop-onlain.fun/snake_worm_offline_zone_downloadbi7e8.pdfIn PDF document text
    • http://mishabelle.ru/83097289709hn514.pdfIn PDF document text
    • http://tgesheff.xyz/merge_zombie_idle_rpg_hackhrq64.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/zTRhagh/55172221659.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/tibgjhf/talking_alarm_clock_free_download_for_android.pdfIn PDF document text
    • http://fenellalucynelle.info/3501318325k0ho3.pdfIn PDF document text
    • http://itclick.pro/no_limits_race_to_sunglasses_satin_carbon_black5clmx.pdfIn PDF document text
    • https://cdn.sqhk.co/gotakavapu/hjdibYj/mars_rover_2020_s_name_reveal.pdfIn PDF document text
    • https://cdn.sqhk.co/runetonorox/ievjcia/ivry_gitlis_videos_youtube.pdfIn PDF document text
    • http://xxlmature.site/plug_dj_bot_commands90gyt.pdfIn PDF document text
    • http://scm03.ru/1941_world_war_strategy_apk_2._1._0gu052.pdfIn PDF document text
    • http://adminhalil.com/98357791456o8zdj.pdfIn PDF document text
    • http://winoorama.website/dig_emulator_frontend_apkrf94p.pdfIn PDF document text
    • http://baby-slings.ru/933722532686sqn4.pdfIn PDF document text
    • http://mon-fortuneo.best/wusezupazejz4c23.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/pevarijidasalop/fda_juice_haccp_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/gafeketawigusibibaw.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/nerovile.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4E 2900 bytes
SHA-256: c4c77de79185a6e32b969612b4158c72aca0a6965e648bc7cf893bc7a336abbf
font_01_sfnt_off0000d5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A8 5164 bytes
SHA-256: d82e444246feea987350ca5dbb654d53a0be6a11ce713d9ac048f4bae10b6352
font_02_sfnt_off0000e722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE722 11136 bytes
SHA-256: 1585931b3681a6067f346b0f6179bf5f4667bc5fc95474d82b2a6de7063a3e85

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