Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef22232b168cf4d…

MALICIOUS

PDF

72.6 KB Created: 2021-03-27 11:54:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 068ed443b2a50da6d13b65e5e6ec566d SHA-1: 166dc9d3205d2fe57a646c2a9d6e4628c886dfef SHA-256: aef22232b168cf4d0043fe84c901280c018a6c523db625f2c46677c45ff2aac0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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

  • 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://vilenefex.ru/strik?utm_term=how+to+reset+a+whirlpool+quiet+partner+3+dishwasher PDF link annotation
    • http://idealslim-ordina.site/14543104512k33fv.pdfIn PDF document text
    • https://zuxizakubapepo.weebly.com/uploads/1/3/4/3/134317428/4428861.pdfIn PDF document text
    • https://cdn.sqhk.co/govonesed/jdifK28/software_update_apple_stuck.pdfIn PDF document text
    • http://getchambre.xyz/how_many_calories_in_taco_bell_breakfast_quesadilla9rkc5.pdfIn PDF document text
    • https://cdn.sqhk.co/fomanazoravu/YST85jj/65086074071.pdfIn PDF document text
    • https://xibupofuku.weebly.com/uploads/1/3/5/3/135306475/8255070.pdfIn PDF document text
    • https://fijesawe.weebly.com/uploads/1/3/4/6/134630878/acd5f7094.pdfIn PDF document text
    • http://repair-foto.ru/nosipinasugoteo0tv9.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxopejitin/fv2AhbJ/94760211147.pdfIn PDF document text
    • https://cdn.sqhk.co/metajewamiva/lYjerk9/motafifokotaluxukitu.pdfIn PDF document text
    • http://lalat.space/xaguzebutojc4kqy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_0b58e4be32144c37ab3eaabab762b177.pdf?index=trueIn PDF document text
    • https://044ec7df-721b-4788-b209-87474a3fcb06.filesusr.com/ugd/60ffa2_78dc327607a94b34bdb602c935154eaa.pdf?index=trueIn PDF document text
    • https://c4fca8c4-0f54-45c3-ae88-320069d86c16.filesusr.com/ugd/ac0d21_54daf02d31e640cdac05e8019b95da6e.pdf?index=trueIn PDF document text
    • https://97d49ff2-d914-4ae4-8ac8-5e5cf5f77cad.filesusr.com/ugd/6350c7_0c350cb18b1b4b1bb27e4d041ef5cc2c.pdf?index=trueIn PDF document text
    • https://995be609-08d3-41b1-a6c0-90e53670bcec.filesusr.com/ugd/9988e1_5428fa415c7445dcbeab5fcd8c749cac.pdf?index=trueIn PDF document text
    • https://dedb376b-efc3-4528-ac10-fc65d12f866c.filesusr.com/ugd/5f6074_d5b8c617a08348238a670652818b40f0.pdf?index=trueIn PDF document text
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_6b8197ea832a48cc88c7b9ce371e2184.pdf?index=trueIn PDF document text
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_7f0c83543a1b443c9f185894802eabd9.pdf?index=trueIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_7c1964472ee14022b2d9db8e35b371a3.pdf?index=trueIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_472e35db8a28476699aa033ffc7ca9d7.pdf?index=trueIn 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_off0000da53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA53 5392 bytes
SHA-256: 14b2ff168b13a01604b1a151c7c29cc1291b653138d201716ec0a3a4b63fe653
font_01_sfnt_off0000ecad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAD 11268 bytes
SHA-256: bed21f7927b24a24e8aa24d7b119d51fc797eb5d06ddc7a907a267037413f05b