Malicious PDF — malware analysis report

Static analysis result for SHA-256 4262a5074a50f6bc…

MALICIOUS

PDF

90.2 KB Created: 2021-02-23 13:13:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 90509ed4d8fc0f0073d9528c26aea329 SHA-1: b351da7ac28cd52d67766961ef575781001c2f8c SHA-256: 4262a5074a50f6bc5a39704aaa7c2d79d8819352a2166c11d8ba4057f294fb78
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or malware distribution. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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/wb?keyword=what%20is%20core%20hardware%20with%20examples In PDF document text
    • https://static.s123-cdn-static.com/uploads/4475988/normal_5ffe0bf9efddb.pdfIn PDF document text
    • http://coolmag.biz/vigumokasiworiwumatapolbflh.pdfIn PDF document text
    • http://civiliscmq.online/mexirblvx0.pdfIn PDF document text
    • http://pevojatinolotej.22web.org/honda_4514_mower_battery.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476011/normal_5fda8ab826215.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375514/normal_5fe560e1bd407.pdfIn PDF document text
    • https://cdn.sqhk.co/kinifukix/ibLMgid/lovukonuk.pdfIn PDF document text
    • https://cdn.sqhk.co/muluxodipoto/idhhXhb/digital_wellbeing_samsung_widget.pdfIn PDF document text
    • https://cdn.sqhk.co/vofonowul/chejiid/70537778062.pdfIn PDF document text
    • https://cdn.sqhk.co/wefegiwezon/Biahijg/71896971269.pdfIn PDF document text
    • http://metazoaapc.fun/sherlock_holmes_books_box_setrloak.pdfIn PDF document text
    • http://copyright-security-ig.com/26574937578q7e4d.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/gha0Ugd/arena_theatre_events_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479224/normal_5ff80fa8cae22.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
    • https://s3.amazonaws.com/jedadokuti/fascismo_na_italia.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/antiulcer_activity.pdfIn PDF document text
    • http://bupomejov.epizy.com/fha_appraisal_well_and_septic_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/werepitipawaviviri.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/celtic_md_font_free.pdfIn PDF document text
    • http://vuropomap.epizy.com/10th_tamil_dolphin_guide.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_off00011672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11672 5168 bytes
SHA-256: 8df93525303830acb936113a9198215b3c7fb77cabddbcd668edd539bdbef2aa
font_01_sfnt_off0001281c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281C 10872 bytes
SHA-256: 950b310c554391af851cbd2c802985bb3b580a9547c23abe09ee3265598f3eca
font_02_sfnt_off00014d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D23 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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