Malicious PDF — malware analysis report

Static analysis result for SHA-256 01ca7b91cc25f9e7…

MALICIOUS

PDF

76.6 KB Created: 2021-02-26 09:08:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e7311cf9a7d47dafb130284bb8d7139c SHA-1: 273487ec9ba21252e33e2a6025e3f63aa20b8b1b SHA-256: 01ca7b91cc25f9e7f84e05af6a656cf8aea36a36cb45090b628a3e134426c335
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The embedded links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://druttle.ru/strik?utm_term=tupperware+small+rice+cooker+instructions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4463788/normal_5fd0e0d51bd30.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385636/normal_5ff6548d8bc2c.pdfIn PDF document text
    • https://ferizovewop.weebly.com/uploads/1/3/4/8/134887996/7667203.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417519/normal_5ff5c58ba647d.pdfIn PDF document text
    • https://cdn.sqhk.co/mopewedote/hdmifvR/koguvadokabokar.pdfIn PDF document text
    • https://cdn.sqhk.co/pojimisuso/grge0CM/89975847671.pdfIn PDF document text
    • https://cdn.sqhk.co/sivumazudi/yvnjgib/7361071573.pdfIn PDF document text
    • http://fepenikozi.22web.org/top_5_junji_ito_manga.pdfIn PDF document text
    • https://cdn.sqhk.co/motanunika/hatqvmC/jeveruduxakaleg.pdfIn PDF document text
    • http://loxamukuk.22web.org/how_much_does_an_aircraft_mechanic_make_in_the_philippines.pdfIn PDF document text
    • https://vixixufabajuwe.weebly.com/uploads/1/3/1/1/131163632/majupazebizo_pekivuxijebonum_tigav.pdfIn PDF document text
    • https://cdn.sqhk.co/nilamemiw/mgc3HSg/43397618978.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383568/normal_6017c126bdb4d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://numaxap.epizy.com/gtd_todoist_template.pdfIn PDF document text
    • http://fujuresaw.epizy.com/84291353193.pdfIn PDF document text
    • http://notalopelovawu.epizy.com/javascript_bookmarklet_chrome_android.pdfIn PDF document text
    • http://likitaponuviv.rf.gd/hp_probook_4530s_i5-2430m_specs.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_off0000eb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9F 5184 bytes
SHA-256: 06207f78cd0a0272efdd370d3e0f8682ca94fa67683f524a51b892a969476195
font_01_sfnt_off0000fd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3F 11712 bytes
SHA-256: e31bb1f011610813c3c02f036e1f520c0b6018fa0005afc3778b03b658d8bcd5

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