Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3ffc9dc60b67b19…

MALICIOUS

PDF

76.1 KB Created: 2020-12-31 15:40:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3cc912aea40b64d5a10d692e1844757c SHA-1: f39eb88e76b00d27be8125c447d3567a3e4c555a SHA-256: e3ffc9dc60b67b19913319ca95f5f7a6d8c2b4dfc8a4a7025decae18a2305982
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/123?utm_term=vitamin+korean+book+pdf PDF link annotation
    • https://jezuvafu.weebly.com/uploads/1/3/5/3/135348480/4231276.pdfIn PDF document text
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/4331011.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/ddda436c-0126-470e-8179-a62fd97e2e18/45088721219.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edc4366a-988c-4cf2-ac31-a363de8afded/41831700032.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d607106-96fc-4ef1-97b0-8a18db17049b/dead_town_zombie_survival_hack_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/42611049363.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a9d333c-b94b-4cc3-9615-264a8d44c90e/39965662489.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/200692ae-5593-4d4c-a774-1d58cfbfff20/favojawevinovoboxerogame.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca2bf476-db02-4f9e-b627-4b4b2603aeef/maryland_vehicle_emissions_inspection_frequency.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dc27e4d-e52b-4b4a-859b-ea4075a44c19/zepetazekoxigesakasuwosup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94814cc4-3321-435a-9435-44befa53f016/bojejugixorosujofaxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67d2919f-d29f-433c-8989-f96a761c7d7f/new_new_media_paul_levinson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eebd5e43-067b-4c6d-9445-fe627086d3ef/cake_recipes_for_dogs_and_humans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b917de34-f1bf-4c51-b026-dab2b49395e4/70608335931.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/hyper_street_fighter_2_apk.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_off0000d831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD831 6096 bytes
SHA-256: cd38108f783cb557f107ef4e75d7080cd0df4c1dbfd589cecda9a22f04f143f9
font_01_sfnt_off0000ecc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC2 5148 bytes
SHA-256: 085d71c790dceec6acd51d3b628029425b035cd29efbcc516f1e56806a0acff4
font_02_sfnt_off0000fe2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2F 10776 bytes
SHA-256: 4ce9fa9f62ea0c70685ce85ac9944ce5c80b7debb3ce2b9115e013da05293846

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