Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c33a1b2edd62ad…

MALICIOUS

PDF

67.9 KB Created: 2020-12-16 14:12:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ef61d37c86fa9645c3bc8eafa287e967 SHA-1: ee54909f8a83e82814addb14884c149d7011d618 SHA-256: 61c33a1b2edd62addbdf8defc3e89edc1c9b2e379d3d370c5db0bbec78a1f5bd
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, with one identified as a "phishing information sheet" lure. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious sites, likely for credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/wb?keyword=phishing%20information%20sheet PDF link annotation
    • https://fivalamividow.weebly.com/uploads/1/3/4/8/134857099/najibiwixesev.pdfIn PDF document text
    • https://dubozenerur.weebly.com/uploads/1/3/4/6/134687155/1913452.pdfIn PDF document text
    • https://tagepixibupiz.weebly.com/uploads/1/3/4/5/134586800/tipareboze.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/35d85996-dd24-4467-a3ee-7d57533e22f6/eames_house_plan_dimensions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/886abd3e-2378-4a0f-bd94-725606949271/mebidubo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae67d011-d5ef-4d76-9c63-27bb07761bf4/67621747878.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e3780a9-637b-4559-8867-4de7476ebe76/82360452365.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4b80aaa-cba0-4e7d-87a6-4be42dbe1cf0/holly_area_schools_facebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec10dc06-83f2-4731-ab1c-788faf2912fa/xarofugujugo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f195784-75e7-4644-a2ba-ed1982cf2be1/fesipabevumirewas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48d63db9-5876-4180-9413-1a712cf9637c/91327277275.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f8d518e-baaa-42b2-af96-fc1ddaec4fdc/55004469759.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33056eac-225a-4e02-be2c-dc145bace54f/silver_leotard_au.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_off0000cdac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAC 5148 bytes
SHA-256: 64e3de3611bd41c0455416f65a2fc30b04a663a38e63574f3da508f230fcdc76
font_01_sfnt_off0000df06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF06 10512 bytes
SHA-256: f183dbb8f8f3d978f7e2a80ad94b72722fe9d2066c57aaa863a2379b2ae0a94b

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