Malicious PDF — malware analysis report

Static analysis result for SHA-256 87fe01fc0060209a…

MALICIOUS

PDF

74.7 KB Created: 2021-01-17 12:42:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: bb227aa18fbb5f5bb263597a4cf536b4 SHA-1: 8188b4a89e9c5e9734089aec41ea3ddbce18d2a4 SHA-256: 87fe01fc0060209a85d87d9416cecf1ffe6712e96c8547998d09ac36b3119596
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link and a large link farm. The embedded URLs suggest an attempt to direct users to potentially harmful websites, possibly for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 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.
  • 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.
  • 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://ggtraff.ru/aws?utm_term=twitter+analytics+app+android In PDF document text
    • https://mesipaku.weebly.com/uploads/1/3/1/3/131383407/9f0f71ba.pdfIn PDF document text
    • https://site-1175531.mozfiles.com/files/1175531/12202491693.pdfIn PDF document text
    • https://site-1197643.mozfiles.com/files/1197643/senebedevadiwun.pdfIn PDF document text
    • https://site-1179698.mozfiles.com/files/1179698/lover_math_teacher_valentines_day_school_educational.pdfIn PDF document text
    • https://cdn.sqhk.co/xezojutatow/cjaTXgc/65916430497.pdfIn PDF document text
    • https://site-1179105.mozfiles.com/files/1179105/tepaniboze.pdfIn PDF document text
    • https://cdn.sqhk.co/gutemokerezo/jggKjcc/emerging_science_journal_impact_factor.pdfIn PDF document text
    • https://cdn.sqhk.co/nonuripot/ZYM7AMB/eqfy_equalizer_v1._1._7_paid_apk_downloads.pdfIn PDF document text
    • https://site-1168264.mozfiles.com/files/1168264/chicken_run_ideas_pvc.pdfIn PDF document text
    • https://cdn.sqhk.co/kisereta/ggdieji/vector_marketing_pay.pdfIn PDF document text
    • https://fozipomeripimak.weebly.com/uploads/1/3/4/6/134610298/dalagivume-nafima.pdfIn PDF document text
    • https://vulajavup.weebly.com/uploads/1/3/4/6/134683256/xoxedirivefiwirarug.pdfIn PDF document text
    • https://site-1178842.mozfiles.com/files/1178842/billboard_2018_list_performance.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/5jeggjw/m_e_inspection_form.pdfIn PDF document text
    • https://site-1176740.mozfiles.com/files/1176740/puguvav.pdfIn PDF document text
    • https://site-1177257.mozfiles.com/files/1177257/ranilixojuborusilom.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/dojonuta/nezovifarokeguro.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/weather_report_for_culpeper_va.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_off0000e6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CC 5208 bytes
SHA-256: 56ed04101013adc566df566cc44d053a08c88ee7662a1a9cabb04e2d77c543f7
font_01_sfnt_off0000f8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A9 10952 bytes
SHA-256: 813d7e928ac1ad93a703a74d090c31787ff1871f05423434290b05e30985ddee

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