Malicious PDF — malware analysis report

Static analysis result for SHA-256 97d0dd3c92ba1027…

MALICIOUS

PDF

44.3 KB Created: 2020-11-06 04:55:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6cd61f807fe6f2a7dfee06cfb33eed43 SHA-1: 982acacb3d8820d2658d0d53fd64378e7a9486fe SHA-256: 97d0dd3c92ba102719fbf40d37fce4b26543fc0ab593bf0e23d611ed3ecb1e91
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, identified as a link farm. The primary URL, 'https://traffking.ru/123?keyword=us+navy+style+guide+2020', suggests a potential SEO manipulation or content distribution scheme. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent behind the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffking.ru/123?keyword=us+navy+style+guide+2020 PDF link annotation
    • https://kexinebig.weebly.com/uploads/1/3/4/3/134338338/werigulus-nivudigud.pdfIn PDF document text
    • https://sabijodamibig.weebly.com/uploads/1/3/0/7/130775907/ratixejig.pdfIn PDF document text
    • https://vakesefujes.weebly.com/uploads/1/3/0/7/130739027/rinabi.pdfIn PDF document text
    • https://tagepixibupiz.weebly.com/uploads/1/3/4/5/134586800/rifoferov-tizubilifesumo-jewopapada.pdfIn PDF document text
    • https://xikemusuvef.weebly.com/uploads/1/3/4/3/134322181/2875894.pdfIn PDF document text
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/jebelilukaxigesom.pdfIn PDF document text
    • https://vobudofokivelux.weebly.com/uploads/1/3/4/5/134599261/bisedisukuzovuja.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/luvijonikexurazure.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/c57ef3dd-4a1f-40c8-aed2-f03a986a15a5/medela_pump_in_style_advanced_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f6530dd-085c-4a95-8f3f-ee60509d5cee/3210719501.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adfaed23-5b9c-43d2-a7f0-1e8f36284daa/18980003647.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/32791781070.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_off0000632e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x632E 5096 bytes
SHA-256: 7552e4c1b34e397413bd93783f817ed01dc1bef0cf64710771fbbc444a0b6902
font_01_sfnt_off00007497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7497 9928 bytes
SHA-256: 332305228f55cc57362709a24879a256c1d4585931c4ac10aea1eea32080a591
font_02_sfnt_off000096ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96AE 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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