Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dad36c734a4292b…

MALICIOUS

PDF

73.8 KB Created: 2021-03-24 15:22:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9684ceddfee4c359380909c1e11a9b38 SHA-1: b98da83028de5756f9b96129fd391996c21a89a7 SHA-256: 8dad36c734a4292b8795776a8f4953179105cd4edc7c70426e41f2f03a5e5648
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 0.9997

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://golowaki.ru/123?utm_term=camry+2013+hybrid+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469126/normal_5fd67e9b156f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376870/normal_60222fbcae36f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385412/normal_5fe292505a027.pdfIn PDF document text
    • http://fapenas.22web.org/siliraganuxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476434/normal_60308d6e7c9fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448727/normal_603ab0371028d.pdfIn PDF document text
    • http://bogavevi.22web.org/9784761103.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424682/normal_60298abdc2372.pdfIn PDF document text
    • https://tusezewepoxir.weebly.com/uploads/1/3/4/3/134339989/8b8b3f697e9aa.pdfIn PDF document text
    • https://konoxitewe.weebly.com/uploads/1/3/4/4/134494736/2953747.pdfIn PDF document text
    • http://rigovutamejebum.iblogger.org/halfords_automatic_battery_charger_user_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486983/normal_600dd278bc295.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486190/normal_5fe10f1b72f87.pdfIn PDF document text
    • https://nevitasez.weebly.com/uploads/1/3/4/3/134305442/9184538.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
    • http://regexepa.epizy.com/10592236553.pdfIn PDF document text
    • http://fekimemisuj.rf.gd/can_i_start_lifting_weights_at_40.pdfIn PDF document text
    • https://f98f40d2-b649-4e6b-99af-b89bbf2331ff.filesusr.com/ugd/724bd4_6c375a212df74dbc96117f04e7523d72.pdf?index=trueIn PDF document text
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_389703f6803f4f3580c0b32b204ecb16.pdf?index=trueIn PDF document text
    • http://lepomosafajuki.rf.gd/balu_video_songs_com.pdfIn PDF document text
    • http://kuzojepume.epizy.com/fexegodusasej.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD773 5216 bytes
SHA-256: c60d9b257a3b16623027eb65c24bc7f8560ae5d6244c912c66caf63d7deaec39
font_01_sfnt_off0000e8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FA 10140 bytes
SHA-256: c4b4d35fa2a971e306289b7af46e5b3bffe2219f466087b3ff23930217adde8d
font_02_sfnt_off00010bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD5 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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