Malicious PDF — malware analysis report

Static analysis result for SHA-256 0656ca528e71b094…

MALICIOUS

PDF

94.5 KB Created: 2021-02-21 02:40:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 00cf1cbb56e7d1a4f0b113d07fac7124 SHA-1: e261a00680f10be88e8c53c7c3617aecb4f37779 SHA-256: 0656ca528e71b094fdbdd83bf20183b6eff42d823fdc0b678238c65deba1813a
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, indicating it likely serves as a phishing or redirection lure. It contains a large number of embedded links pointing to various external domains, many of which are hosted on disposable or link-farm-oriented infrastructure. The primary malicious URL identified is https://yafferge.ru/123?utm_term=how+much+do+starbucks+baristas+make+in+denver, which is flagged as a known malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/123?utm_term=how+much+do+starbucks+baristas+make+in+denver In PDF document text
    • https://gaxowaxogofesix.weebly.com/uploads/1/3/4/7/134719425/6763859.pdfIn PDF document text
    • https://figinesixixe.weebly.com/uploads/1/3/3/9/133999389/purodaki.pdfIn PDF document text
    • https://laxuruvu.weebly.com/uploads/1/3/1/4/131482832/777263.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvupewog/hc7vjiu/93107447593.pdfIn PDF document text
    • https://gerikolobel.weebly.com/uploads/1/3/1/3/131398187/b9e5be88080.pdfIn PDF document text
    • http://demegudatodura.iblogger.org/du_date_sheet_2019_may_june.pdfIn PDF document text
    • http://losadodika.22web.org/red_harvest_star_wars.pdfIn PDF document text
    • http://mojuluxemo.22web.org/2668752930.pdfIn PDF document text
    • https://gagakulusete.weebly.com/uploads/1/3/5/3/135326625/nemuperejejimom_kasox_katizez.pdfIn PDF document text
    • https://zobatovegu.weebly.com/uploads/1/3/0/8/130873738/1013078.pdfIn PDF document text
    • https://zizonilorixu.weebly.com/uploads/1/3/4/7/134772478/gojobi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://ludoxijijux.rf.gd/63299330274.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/orbital_cellulitis_nice_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/cartoonize_photoshop_action_free.pdfIn PDF document text
    • http://jibovofafef.epizy.com/wijebutevitazofafima.pdfIn PDF document text
    • http://jamurujitexezi.epizy.com/debijepeluvukuwawojitizuk.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/exponents_practice_worksheet_answer_key.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_off000127e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E6 5348 bytes
SHA-256: 77f12a02804cd46091e252373ed301f644903cbeb54960150426fa5e816cbf87
font_01_sfnt_off000139fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139FA 10732 bytes
SHA-256: 0d50b99035512665c92367bd7eac407ffc8b86c7e8b628ff5bcd97a0de7ba9be
font_02_sfnt_off00015e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E8C 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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