Malicious PDF — malware analysis report

Static analysis result for SHA-256 3845287aeab6593b…

MALICIOUS

PDF

74.4 KB Created: 2021-03-14 13:50:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4efe167728098012792c97b3069fb921 SHA-1: 906a86c9949c96937b28b367e545b5293c8d2d3b SHA-256: 3845287aeab6593be70a7ec3c07fdda9b7ea128295d9d381b51a9e587727fa6f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, a technique often used in SEO poisoning or phishing campaigns to direct users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' and the presence of many external URLs, including one pointing to 'mezovuduw.ru', strongly suggest a malicious intent to redirect users. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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://mezovuduw.ru/strik?utm_term=dell+optiplex+790+cmos+battery+type PDF link annotation
    • https://cdn.sqhk.co/tamejenonisi/sc1ijh6/cbt_nuggets_linux_lpic-_1_series.pdfIn PDF document text
    • https://jutonoxefakevuw.weebly.com/uploads/1/3/1/4/131454335/lofajilujez-funipukoduxo-jurakibu-lulexepokisutin.pdfIn PDF document text
    • https://busiwilepajij.weebly.com/uploads/1/3/4/3/134353274/25eb0.pdfIn PDF document text
    • http://opt15.ru/xariteledik0klv4.pdfIn PDF document text
    • http://koteyarn.moscow/tom_clancys_rainbow_six_siege_epic_games8gaz9.pdfIn PDF document text
    • https://cdn.sqhk.co/lasanamemego/dwhiRhh/radiant_heater_for_garage_use.pdfIn PDF document text
    • https://kasivolonu.weebly.com/uploads/1/3/4/6/134688646/633b6c65c.pdfIn PDF document text
    • http://onesmall.space/141628589840f06b.pdfIn PDF document text
    • https://rojomitalo.weebly.com/uploads/1/3/4/4/134485393/zuzekotimap_bepizevur_fabowemos.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/tugabijenovili/banorizepemisuxebiba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b94c878-aae8-49cf-a706-89d04dd2e9cf/does_anyone_still_make_a_radial_arm_saw.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/zukinavusolofanopowidozi.pdfIn PDF document text
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_020eea54391f4cce8a380be262f7eb64.pdf?index=trueIn PDF document text
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_38795e657b174770916d59705217510e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8594ee9-4f05-488d-af4d-cb27e0e5c6ad/69211908443.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/dumudujuxolavazaw.pdfIn PDF document text
    • https://f6ea5e03-7e7c-4dce-82ee-fd5d223759ef.filesusr.com/ugd/d203ad_36d84730eb1f484580dab83626e1423d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/00d53c60-6732-489c-97e6-42bce0933e0a/how_long_to_cook_spare_ribs_on_a_smoker.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/bosch_maxx_varioperfect_washing_machine_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4497abf-1476-4343-a2ea-3830e07322e7/56659504813.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49bc8ba2-b5d5-4eb5-88a3-331dfa35a938/logitech_m557_bluetooth_wireless_mouse_mice.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/toshiba_dvd_and_vhs_combo_recorder_player.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_off0000ceba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBA 6388 bytes
SHA-256: def9cfa8d1338913d0b0a20108102481f58688201a04cf682f90ac2defa1f800
font_01_sfnt_off0000e424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE424 5764 bytes
SHA-256: 4e40d6aff2ec71c1d30ea55949355a5510a5171254c92a082973b4e0cfd9e22a
font_02_sfnt_off0000f7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BD 10792 bytes
SHA-256: d01f609d4c28122c40cde937847e38da78d54d24c1a11682f5b2aa32fff1a4c8

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