Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb79c60a541fbef6…

MALICIOUS

PDF

82.2 KB Created: 2021-04-05 18:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9ecdb845a3f562ea0ae87c27b4f9585d SHA-1: 8a3ebc7b6061ca629279288a992590ea8d27182a SHA-256: fb79c60a541fbef642e8d94d830830b46d308b204ecbc296f3f1886bb9ff1d2d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9991

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://botokaw.ru/strik?utm_term=can+landlord+refuse+to+renew+lease+bc PDF link annotation
    • http://rigewojugofalas.iblogger.org/boring_but_big.pdfIn PDF document text
    • https://lovelutunaguj.weebly.com/uploads/1/3/4/7/134735325/a8b71fd939fc.pdfIn PDF document text
    • https://cdn.sqhk.co/bemovunilupo/Xjbrqjg/1304511084.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417321/normal_5fde6902b886a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389085/normal_602921f3a872e.pdfIn PDF document text
    • https://nogikukejigili.weebly.com/uploads/1/3/0/8/130873965/5a88775b6.pdfIn PDF document text
    • https://retixuzekuzexaw.weebly.com/uploads/1/3/4/3/134375726/luwonilaw_befupitim_bozip_potubisoxiva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370273/normal_601e8b1800600.pdfIn PDF document text
    • https://cdn.sqhk.co/kokijunuxagi/iheicHe/raja_bhaiya_video.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467007/normal_60017f863bf76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475730/normal_6062cbff7cf9f.pdfIn PDF document text
    • https://kuzogirig.weebly.com/uploads/1/3/4/7/134748708/2534284.pdfIn PDF document text
    • https://cdn.sqhk.co/kigimole/eulHOJz/41462373957.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_2388109d6d644edab1d48f3827486f72.pdf?index=trueIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_866fc5fb76074b38af97d300c375fa73.pdf?index=trueIn PDF document text
    • http://gurerixid.rf.gd/49238159404.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/astrophysics_and_space_science.pdfIn PDF document text
    • http://labopum.rf.gd/latest_cheap_android_phones_in_nigeria.pdfIn PDF document text
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_2af60cab56c94c2eb1a8a681cf87e14d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/kimidafasusifepokolev.pdfIn PDF document text
    • http://xikimafelote.epizy.com/webojonovi.pdfIn PDF document text
    • https://c216880a-03a2-4774-ab7e-121c93799e8f.filesusr.com/ugd/b5aed9_cbd2db0cabe84c67beaf8d1fb3f925b1.pdf?index=trueIn PDF document text
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_bf640cf655d14f0b858ff78b144aca27.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dekogamik/56914464142.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_off0001023a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023A 5152 bytes
SHA-256: f332e1586666e6e0c778bea007dc277adc40db72843c4a0554a01135b37af302
font_01_sfnt_off000113de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DE 11408 bytes
SHA-256: bfce2c144bcdc17dab0a63a39a7a6c0fa8089d67885bcd1b6f38b720cbf7d1ac

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