Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e26d083870a766…

MALICIOUS

PDF

81.4 KB Created: 2021-03-28 07:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e753e88834adac11a2ea88a946484d1 SHA-1: d7445b59a17ff74975e6f138c3fd8782f34021c2 SHA-256: 28e26d083870a7662a0a7273fd9d437c8d6b44aab3ff5d8e7572e91bc69fecae
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, suggesting a campaign to drive traffic to various websites. The ClamAV detection and ML classifier flagging indicate malicious intent, likely phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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.
  • 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://botokaw.ru/123?utm_term=sample+answers+to+retail+interview+questions
    • https://wefogazasu.weebly.com/uploads/1/3/4/8/134880183/40b336141f.pdf
    • http://jizefuli.22web.org/the_secret_scripture_movie_trailer.pdf
    • https://gisodotok.weebly.com/uploads/1/3/5/9/135971357/dovasuravamukon.pdf
    • https://dovavifedudefew.weebly.com/uploads/1/3/2/7/132710721/b0198d87cb0868.pdf
    • https://cdn-cms.f-static.net/uploads/4451941/normal_600a6ca8ab99a.pdf
    • https://bubizepanawip.weebly.com/uploads/1/3/4/4/134480996/fikotegimib_pepuriwot_jepakuvivi.pdf
    • https://pogunokele.weebly.com/uploads/1/3/0/7/130739789/sipomufevisixalakezo.pdf
    • http://zozegakipuvi.iblogger.org/57522039993.pdf
    • http://fisuruwibowin.66ghz.com/anatomy__physiology_coloring_workbook_answers_chapter_10.pdf
    • https://cdn-cms.f-static.net/uploads/4461234/normal_600da64a04380.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_f02e03db96744254b044212876fff3fd.pdf?index=true
    • http://nazonuretowu.epizy.com/puxetepaniz.pdf
    • http://lusetazok.rf.gd/diseos_del_proceso_de_investigacion_cualitativa_sampieri_resumen.pdf
    • https://s3.amazonaws.com/zunaporam/k_n_oil_filter_reference_guide.pdf
    • http://zisibife.epizy.com/livabutefibose.pdf
    • http://dogurof.epizy.com/88540193545.pdf
    • https://s3.amazonaws.com/gomakobez/aaina_movie_all_song.pdf
    • http://vurujixeja.rf.gd/how_old_is_the_dell_optiplex_3010.pdf
    • https://b133b025-67d1-4190-9e53-fbb99503dec2.filesusr.com/ugd/caf13f_e7e18bf27eb346aebff8771146a38c21.pdf?index=true
    • https://b0cee159-9ce3-47d2-9452-de9e383f1b6b.filesusr.com/ugd/fac5c7_f61623fc03114b1d802bb1aa558e4ae7.pdf?index=true
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_0815138ee173434291cd6d40777594cc.pdf?index=true
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001020c.bin
99a74044cde45401461590f1a92da3e63040fa5117421ac695a9e00997187984		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1020C 5344 bytes
font_01_sfnt_off0001143c.bin
8fe1afc0d2f76b6731a7ff513f90c966775292de8d1268b5c21059cf9c6d947f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1143C 10980 bytes

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