Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8409aca3ac019e9…

MALICIOUS

PDF

85.4 KB Created: 2021-03-25 01:20:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1d3cf6325ecc2b910868d03f77fa3c6 SHA-1: 962f2c4c5f227397d5379e8935671159b6deaaf1 SHA-256: a8409aca3ac019e9364f19b22fc35a12922524f96bac6eaba26e933735ef2c75
156 Risk Score

Malware Insights

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

This PDF contains a large number of external links, many of which point to other PDF documents, indicating a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and external links are indicative of an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=como+funciona+una+maquina+de+coser+electrica
    • https://cdn.sqhk.co/dosakupu/Nt8KZig/stumble_upon_meaning_marathi.pdf
    • http://lebedugipul.mywebcommunity.org/guriz.pdf
    • http://rijexofugovu.medianewsonline.com/bodybuilding_diet_and_workout_plan.pdf
    • https://cdn.sqhk.co/vutenugade/1GMx1jg/92552396865.pdf
    • http://dusanaputojinon.mygamesonline.org/15209731160.pdf
    • https://cdn.sqhk.co/gufezitaxato/gMpvGif/lathe_machine_tools_list.pdf
    • https://cdn.sqhk.co/wuwoxegolewa/icdjbHs/fizesumelekuvenamafunuju.pdf
    • https://cdn.sqhk.co/jiwonukunav/dhahjI0/replika_pro_worth_it.pdf
    • https://cdn.sqhk.co/bexutavukaro/aLZrkvx/roblox_piggy_new_skin_roleplay.pdf
    • http://ruzamaji.getenjoyment.net/taketezaxufez.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_3a1bb3212f1d4381ba9982b7370fd283.pdf?index=true
    • https://9cfe8934-cc69-4f76-a0d0-2e9849ea4530.filesusr.com/ugd/fd9558_3c3a67d771274fa6a3c8309901cea964.pdf?index=true
    • http://zudupaxub.myartsonline.com/honda_rebel_250_weight_limit.pdf
    • https://c1f973cf-d719-4acb-8f9e-cd83ae4fb94d.filesusr.com/ugd/057766_7c40656a14c14fff9b96888fb5d197b3.pdf?index=true
    • https://fb3efafe-1b0e-41a1-9434-8bf556110c4a.filesusr.com/ugd/de5e41_6b34ee5d88e847ef94010d59abf3d72a.pdf?index=true
    • https://6b2f37ea-3696-4b87-858b-663c379f6f6f.filesusr.com/ugd/16879a_55596d32517741d598af0384bde19637.pdf?index=true
    • https://d23eb412-52e1-45ef-a32a-0c032022daee.filesusr.com/ugd/03485a_0f9288295da04db2b5e887c41d4b598d.pdf?index=true
    • http://gekolutewubel.myartsonline.com/m_audio_axiom_air_25_manual.pdf
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_5e8e2ea9c1c340a5906f8e54679eebe1.pdf?index=true
    • https://ce55c564-0e79-48ac-bd91-a034cff8554b.filesusr.com/ugd/bd1fc0_fb523064c40641ad80cde5dd7d0637b1.pdf?index=true
    • http://tibutariwu.myartsonline.com/l_amore_ai_tempi_del_colera_download.pdf
    • http://gapoxuvopa.onlinewebshop.net/34476085459.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f702.bin
c5f5039e0b8fc9b82f611dcb31840597f8a8b36265baf5ba7bb8643b8d8236a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF702 5200 bytes
font_01_sfnt_off00010894.bin
36589c44f187b4cc6856bd93280fbb02999fd8272ed61e7af10e2d18f24c5fe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10894 12356 bytes
font_02_sfnt_off0001305e.bin
aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1305E 16312 bytes

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