Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a7dad7abff2a688…

MALICIOUS

PDF

82.5 KB Created: 2021-05-28 09:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7fc5ef18354bd1d0d2c48dea788401cd SHA-1: d1100ea68c27cb724206961241dbc45e4a3f5f6a SHA-256: 3a7dad7abff2a688efc1b8f8ed07f8f93b0381cb5eea000d29fdc10504da9e58
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, with one prominent link pointing to 'maypoin.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to connecting a tablet to Chromecast, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/strik?utm_term=how+to+connect+to+chromecast+from+tablet PDF link annotation
    • https://megulotajisotem.weebly.com/uploads/1/3/4/5/134592592/vejomajoxapoper.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368474/normal_60699e8716b43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492918/normal_5fe3eb188ca94.pdfIn PDF document text
    • https://gefosutobova.weebly.com/uploads/1/3/4/6/134647182/3d563dbedb6a9ff.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://uploads.strikinglycdn.com/files/fbdd93d7-7705-4e7e-a970-32ce010b91e8/oreck_xl_bags_target.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ba311b4-b3d7-462f-bb80-adfdc97dc346/wakijogojozaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59f19d61-b003-4cce-af68-567735b9b94a/viwowimavugalolojamojat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/716574ce-be0a-4f4c-92e5-9d53220a0b0c/how_do_i_use_qi_wireless_charging.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fce2dbcd-88ff-41c4-9589-07622ce17d33/eberron_3.5_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2c4f832-4725-42ec-b21e-afb48621385e/batujajabeburuxunam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40755e40-b643-4eb0-a19d-15df52ad5931/because_of_winn_dixie_classroom_activities.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e9e3948-7673-4c69-b172-f42282cd02ae/what_is_environmental_ethics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9591213f-74ea-4463-8bb5-eba2cff4870b/60933099704.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffef4dab-baf0-4af3-8daa-433bfe05eed8/how_to_read_if_you_have_dyslexia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a521db92-0f5d-482d-a4bc-7385cc3b8e0d/ministry_of_education_lesson_plan_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35762d38-0617-4f7e-b80f-8022ee08530b/xojirewogejafutikit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7b16010-452e-4e6a-939c-498faaf54fbc/92202049278.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8e2dbe2-10ac-4fb7-abcb-2522c24f5cac/watirizovisofufaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfb1ad15-fea7-4a05-be5e-6d9ee9407915/likad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df4edfce-98dd-4a5e-a331-62b57103a5a8/how_to_thread_bernina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34059ab5-f1d2-4d9b-b12b-8081d95999bb/rotafiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84c5985a-5441-4311-b5e9-e8b322a9fc33/.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_off0000f7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B6 5052 bytes
SHA-256: 0c6b13ea7a6e8fd3a32583fdbd36cac46e2f269088ae0af8087d70e29539446f
font_01_sfnt_off000108b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B0 11356 bytes
SHA-256: 538d0a7986177aa62426beb90be4f1ee06ebc769470f599c3e969c2bc502a3d2
font_02_sfnt_off00012e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7F 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3