Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a326c20b39249c5…

MALICIOUS

PDF

87.0 KB Created: 2021-05-27 23:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 01775bcb186397ed34f233d1b310e9dc SHA-1: aa35b77a7d7c4db448c243eaa8077a1d6279c784 SHA-256: 0a326c20b39249c5f6b0b417f9ce71461ff986b831ba2f7df07932147f0eb326
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external links points to 'jottigo.ru', which is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware through the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://jottigo.ru/123?utm_term=comfort+zone+ceramic+heater+black+cz446wm+manual PDF link annotation
    • https://kixumiziri.weebly.com/uploads/1/3/2/6/132681985/7080319.pdfIn PDF document text
    • https://neripekotijoba.weebly.com/uploads/1/3/2/6/132681370/widufigafanaloniki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495413/normal_6058dee4e1999.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448330/normal_602529f5b77a6.pdfIn PDF document text
    • https://pinobuni.weebly.com/uploads/1/3/0/9/130969003/gokuxuxajidaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459337/normal_600e67a3b35ca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0e57dbe-ab94-41cd-a739-78da54b35393/tuvefevevajerulilarawox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fdda81c-2ccc-49c1-9703-ab7c07b9db44/webatepubupisasezusu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70c27813-e6e3-41b0-a94c-30142893bfe7/98699079788.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/063ba645-3a87-4837-885b-325ebe45f292/how_do_i_set_my_citizen_eco_drive_8700_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/548adea5-0482-4948-827a-9d6efe36abe4/jozazoligerewatezemuruxok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b1b7c46-8b9c-47a8-872c-aa4f3d96f25f/1653018864.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a09b5e5-dd3f-45e7-90ec-b1b0077b64e8/8966560670.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a81e22b8-52e9-42d7-b705-fd8a4c7dbda7/pagake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcaa6e05-53b4-46ea-959e-26a660edf383/wuvamitusagiputuloronew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5e03e13-0ea3-446c-8a17-3679fea09dee/indian_camp_ernest_hemingway_deutsch_bersetzung.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0380cbf-8e0a-433d-9d3f-2e0fb74d353d/kexutipog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/468dcf3b-04d2-429f-97ee-ff61b8096d04/63592797487.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6388c181-6b5f-4364-bc16-68d4ae691b9d/tekken_3_apk_download_for_pc_windows_7_ultimate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7efe1c0b-92ff-4d8c-bd19-ed0c8230a931/caterpillar_3512_generator_parts_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45ad416a-6de8-4fe4-b63d-0f69931ec7ab/12715346510.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad0f47e3-5918-47aa-8a81-6eef33d437be/how_to_restore_iphone_x_without_computer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9317900-08b8-492c-aa98-e7bf61664c70/90974506711.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6532e3be-eeaf-4835-88e5-c111a2a8b4d3/model_3_battery_range_drop.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_off0001125d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125D 5436 bytes
SHA-256: f3ce01d470ce13cf715407d5acf68b82c9ab371a59b334329869ce64cef2f46f
font_01_sfnt_off000124d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D4 12868 bytes
SHA-256: 988bee7e6ede1d28ab6635cebc5abad0212fcd5af91a27e0ec17f1c1295deaef