Malicious PDF — malware analysis report

Static analysis result for SHA-256 76bcfcf18af3eb1c…

MALICIOUS

PDF

75.5 KB Created: 2021-03-24 08:10:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 05db28a67f0b5fa43dfdcfcfecd2c6d1 SHA-1: 7485cef7fb56d92cfbbd2e521e93d9b28a9dd7c2 SHA-256: 76bcfcf18af3eb1ce18fa9ad3c15efc40d3e106b00bbf2ed7816da1a8fc57c8c
66 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 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 0.9997

Heuristics 4

  • 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://xajibur.ru/strik?utm_term=biochemistry+books+satyanarayana+pdf+free+download+latest+edition PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381766/normal_601a9e651b2d5.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/iwibjaA/broken_dawn_2_mod_apk_1._4._3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369516/normal_6046390cafda4.pdfIn PDF document text
    • https://cdn.sqhk.co/soziwariru/bheMjix/9577143124.pdfIn PDF document text
    • https://cdn.sqhk.co/miweguzeg/Yojgrhd/scary_doll_fake_video_call_on_hangout.pdfIn PDF document text
    • https://cdn.sqhk.co/xubodijixali/YhiGSgf/south_movie_film_2018.pdfIn PDF document text
    • http://dakuximakux.22web.org/95559978240.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/jcbaOs6/16072015568.pdfIn PDF document text
    • https://cdn.sqhk.co/xasurila/gjiHjdj/pibasidaruzubaxubijozolar.pdfIn PDF document text
    • https://cdn.sqhk.co/tezizejaropu/mjglgep/60199154772.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426059/normal_603c36e0d6c5b.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/tumasun/libro_caperucita_roja_del_noroeste.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/volume_compound_shapes.pdfIn PDF document text
    • http://mojogisi.epizy.com/93454940282.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/motat.pdfIn PDF document text
    • http://xetulugesoboko.epizy.com/famimunekudo.pdfIn PDF document text
    • http://situxunekidini.epizy.com/pulse_width_modulation_lab_manual.pdfIn PDF document text
    • http://pufalidupoge.epizy.com/47114190179.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/26407332070.pdfIn PDF document text
    • http://litosivofojolid.rf.gd/75621955353.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_off0000e5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C5 5844 bytes
SHA-256: e46cce1438e0305fda53bbccb11b16bb063f5218af6ebeac40e95262a46a6959
font_01_sfnt_off0000f997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF997 10628 bytes
SHA-256: 4589b823f880f2b3d5e8e283713793d449ae02e62412b6f849103c28a8171473

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