Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf3af0460b69817…

MALICIOUS

PDF

110.9 KB Created: 2020-12-21 01:51:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9f6497246c9064d40eef986a0ee855d3 SHA-1: de7eecc7fe8eed261ade5883015fe99d784a468b SHA-256: ecf3af0460b69817806c8a6298b992590851e255ff290428bbf40ff86fd3ed95
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 0.9996

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://trafffe.ru/aws?utm_term=bts+erpc+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368962/normal_5f9550b6ae0dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383805/normal_5fa344ed3756d.pdfIn PDF document text
    • https://tofejigijo.weebly.com/uploads/1/3/4/3/134312142/pebetenenetetifelur.pdfIn PDF document text
    • https://pufoxufuzevelo.weebly.com/uploads/1/3/4/4/134486621/nokavemupubara.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426954/normal_5fa7c9683178f.pdfIn PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/rakoximotelu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388289/normal_5fbd8352e756c.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/0668ca96-f3bc-4763-951f-d877001aa474/rab_guide_2_gtx_gloves.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93e833b9-c74d-4a92-98c2-3234a03de594/peneberonibinizezoxefiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b79a9fed-4624-45e2-ab70-48cac2d8f2cc/black_clover_episode_62.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ece4034-52f5-4442-a893-beeae573962a/69076835701.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c547315-9cd7-4871-92e6-5372646496a2/15469204997.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9710d73-f07b-452a-9609-04d455bc158d/columbia_high_school_il_skyward.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_off0001699e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1699E 4480 bytes
SHA-256: 9e2f428d824749c8aab20002bdd39c76c9f8714824db517f2d10ef5cc1a7eb24
font_01_sfnt_off000178e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178E9 12412 bytes
SHA-256: 46f40a359b707123e8ae93999288ccb5ce9f766dcff13dd0956b79ac63895566
font_02_sfnt_off0001a053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A053 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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