Malicious PDF — malware analysis report

Static analysis result for SHA-256 10cbc1b2bcfcd241…

MALICIOUS

PDF

78.3 KB Created: 2021-03-21 00:19:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6b0d9eb36e91f88a2d8e38ea3102fdca SHA-1: 9adb0e64f08e4ceed0181d69b2457dc58c310632 SHA-256: 10cbc1b2bcfcd24158f7ba02900bc98e6e5e9db82101e641cd0186cf43e6b923
94 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content. The ML classifier strongly suggests malicious intent, and the presence of a link farm on disposable hosting further supports a malicious campaign. The embedded JavaScript is likely responsible for initiating the download or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lozipotod.ru/award?keyword=companies+act+2020+amendments+2020+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417426/normal_5fcda1eb414b6.pdfIn PDF document text
    • https://detaxenenikub.weebly.com/uploads/1/3/0/7/130776267/be0b118.pdfIn PDF document text
    • http://topcabinets.xyz/fonunelebh4oj5.pdfIn PDF document text
    • https://gedesinikus.weebly.com/uploads/1/3/5/3/135323437/bobuduvadulila.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404103/normal_6013a6831e6d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366623/normal_5ff15b67a9eda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454556/normal_60567291535cb.pdfIn PDF document text
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/aeb452d3e.pdfIn PDF document text
    • http://magic-spring.com/how_to_fix_a_leaking_moen_roman_tub_fauceti4rck.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464869/normal_6042da0941bbe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/tuwile.pdfIn PDF document text
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_8fde191ce0684739bde30f3de3453f70.pdf?index=trueIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_05c7bbb3b55c4291b8b17847d6fbbea0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fujadabez/10632283124.pdfIn PDF document text
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_26dd308996844dbc850c11b9672024a0.pdf?index=trueIn PDF document text
    • https://9e6c4f0b-3406-4274-bf8a-5be7f948d240.filesusr.com/ugd/45c6ff_93469a71c1b641ba8a5dd766f16b782c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tinezedu/rebel_star_ambarish_images.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/jayco_motorhome_owners_group.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_off0000f349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF349 5352 bytes
SHA-256: 9553c8b536ba86bbe08d5f9c34863bbbfa7fcd2aac3bee61d81e96bc9f521fed
font_01_sfnt_off00010569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10569 10876 bytes
SHA-256: 8392771e15e5c683c12b41570c81afd2cb54150a128eaeb19d5a7f06bd9cabe5

Open this report in the interactive analyzer, or submit your own file for analysis.