Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a1b737cb0b6e95…

MALICIOUS

PDF

76.6 KB Created: 2021-02-26 10:53:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 01b569b9e6c2733a9a9f59a30c99bb5d SHA-1: 9316006cf440792901a400ad4ec98472394b3945 SHA-256: 11a1b737cb0b6e9595d6321620294ed75553f0c86764c30a8bbb7076bda61d20
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document's content and numerous embedded URLs suggest a link farm or SEO spam campaign. The ML classifier strongly flagged this PDF as malicious, and the presence of many external links to potentially disposable domains supports this. The document body, though heavily obfuscated, contains text related to 'simple mp3 downloader apk 2018', indicating a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://resalured.ru/wix?keyword=simple+mp3+downloader+apk+2018 PDF link annotation
    • http://tiktoktop.design/34412121355eqjha.pdfIn PDF document text
    • https://cdn.sqhk.co/dasofuduveje/oTghiag/jabogunas.pdfIn PDF document text
    • https://digulowewuw.weebly.com/uploads/1/3/4/3/134363346/6579975.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410020/normal_5fd63b1a3026d.pdfIn PDF document text
    • http://zaxanoxejem.iblogger.org/quick_bible_study_video.pdfIn PDF document text
    • http://mepanawabopod.22web.org/12282257477.pdfIn PDF document text
    • http://sputnews.com/atomic_absorption_spectroscopy_nptelfacgj.pdfIn PDF document text
    • https://feboratopaw.weebly.com/uploads/1/3/1/3/131383734/2640870.pdfIn PDF document text
    • https://vevuduwas.weebly.com/uploads/1/3/0/7/130775740/saziped.pdfIn PDF document text
    • https://cdn.sqhk.co/rifelefiw/UIlghHs/14324335930.pdfIn PDF document text
    • https://kisisixixugejo.weebly.com/uploads/1/3/0/9/130969502/cf3096.pdfIn PDF document text
    • https://temeromaxuzi.weebly.com/uploads/1/3/4/7/134745627/63857e6d33e64.pdfIn PDF document text
    • https://cdn.sqhk.co/tamurikubol/jigeia4/46556011360.pdfIn PDF document text
    • https://cdn.sqhk.co/wafavalufa/zu5WhhX/draughtsman_meaning_in_kannada.pdfIn PDF document text
    • http://milky-rp.space/8888243989yqhwj.pdfIn PDF document text
    • https://nefajawijar.weebly.com/uploads/1/3/6/0/136081949/xarivewizowoguduma.pdfIn PDF document text
    • https://zokofefedepop.weebly.com/uploads/1/3/1/4/131437243/87530f1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vosegigusuxiku.rf.gd/3438945164.pdfIn PDF document text
    • http://gonoluripep.rf.gd/ribagawezegubitipenopa.pdfIn PDF document text
    • http://xufoxozotelu.epizy.com/49062563897.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA9 5868 bytes
SHA-256: 4704899d0b18d81aff8a8f09c6f2d114c42e9cf0cef22a48db135a1f7094eff8
font_01_sfnt_off0000ffa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA1 10872 bytes
SHA-256: ea033bcc6eb90379596997851f0a2a0e6e4384a0081bddb3fe8f67c260365d77

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