Malicious PDF — malware analysis report

Static analysis result for SHA-256 0acc1a1d88bea5d7…

MALICIOUS

PDF

101.1 KB Created: 2021-03-28 20:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8920c5e2f1b575a5e20f73d7783994aa SHA-1: c95d24e728dcdc3fa824e24a3aebe4676b40cbf4 SHA-256: 0acc1a1d88bea5d7da2e7242e92c7f10dcc1402d77f33edf37ec8ee862f6a4a8
192 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains embedded links and heuristics indicate it is a malicious redirector and link farm, suggesting an attempt to trick users into downloading files. The presence of a 'download button' lure further supports this. While no scripts were directly extracted, the nature of the links and the ML classification point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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
  • 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://yafferge.ru/wix?keyword=cyanogenmod+file+manager+apk In PDF document text
    • https://zavisedifigi.weebly.com/uploads/1/3/4/3/134316550/6e3b37523f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410694/normal_5fda1d0b07a6f.pdfIn PDF document text
    • https://digexuvin.weebly.com/uploads/1/3/2/8/132814990/5e3862e09.pdfIn PDF document text
    • https://ribofefafuf.weebly.com/uploads/1/3/4/7/134770843/defivukoxax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471455/normal_602e31bcd34b3.pdfIn PDF document text
    • http://criticcxck.space/ziwizasain8u8.pdfIn PDF document text
    • https://xuwumiguxapizif.weebly.com/uploads/1/3/0/7/130739656/netazupi-nivifawu-tazuxe-vezew.pdfIn PDF document text
    • https://vufepuxo.weebly.com/uploads/1/3/4/5/134522835/9b2cd65c6e47d.pdfIn PDF document text
    • https://badivilaw.weebly.com/uploads/1/3/4/8/134848312/575d868b380b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417123/normal_5feb5fe497a35.pdfIn PDF document text
    • http://opencabinets.xyz/21620051084h77k7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443292/normal_5ff3feead17fe.pdfIn PDF document text
    • https://tefafovok.weebly.com/uploads/1/3/4/5/134588422/1201061.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/iIhdsS5/voltage_drop_chart_240v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501996/normal_5ff20f66262db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420610/normal_5fff5b2c883fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417670/normal_6052d37f0fd9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423454/normal_602e350ed8871.pdfIn PDF document text
    • https://cdn.sqhk.co/tazofexoz/O5hdIia/mezutamedajekemadev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368230/normal_600a52eb44413.pdfIn PDF document text
    • http://znohist.site/the_adventures_of_tom_sawyer_audiobook_chapter_6vdohz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00014b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B83 5252 bytes
SHA-256: 31dddeced72466e586c50ee7b6e58b146d6ba8153471f975d99a01ddd3010920
font_01_sfnt_off00015d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D5A 12716 bytes
SHA-256: cb3c5d5fe11256272316152b562de60c9db4659b75758ef60420d9399a630d52

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