Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c1537925ecec22…

MALICIOUS

PDF

85.6 KB Created: 2021-04-01 01:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 5fc06d78827b147f0cbaa2745ce867db SHA-1: eab05c7bc747a6f2d26ae3df0c7b46130072c8fe SHA-256: 76c1537925ecec22ac5b9f895055167ba85033702ebaa0e6ab0be6c8d24a106c
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The document body is heavily obfuscated, but the presence of external URIs and the PDF_SEO_LINK_FARM heuristic indicate the primary goal is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/wix?keyword=mechanical+energy+worksheet+answers PDF link annotation
    • http://kushtanash.ru/20521302862xl8jj.pdfIn PDF document text
    • https://kazanuwe.weebly.com/uploads/1/3/2/6/132683097/newede_jubatagefor_jexodevejak_sawanedolupo.pdfIn PDF document text
    • http://pubgmobiie.com/83480022457cvxjz.pdfIn PDF document text
    • https://tijozamuworibop.weebly.com/uploads/1/3/1/6/131607374/1166158.pdfIn PDF document text
    • https://nurosizakudagag.weebly.com/uploads/1/3/4/6/134699554/5502165.pdfIn PDF document text
    • http://store50off.info/dell_optiplex_3010_sff_video_card0oo19.pdfIn PDF document text
    • https://dapalirodo.weebly.com/uploads/1/3/1/4/131483520/9212825.pdfIn PDF document text
    • http://sreview.online/risabazefifipidaxasize07v0f.pdfIn PDF document text
    • https://tomadukego.weebly.com/uploads/1/3/6/0/136083679/fomor.pdfIn PDF document text
    • https://xizotuvulozig.weebly.com/uploads/1/3/1/8/131856772/d7ef5e733.pdfIn PDF document text
    • http://construt.site/nitawubotldpm.pdfIn PDF document text
    • https://xozejobe.weebly.com/uploads/1/3/1/4/131406614/luwadev_panaj_nisuzudexet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_8dabfeaf5735429daed0e3fef27b86e0.pdf?index=trueIn PDF document text
    • https://4c8e72c6-e2e3-4108-adc6-102de481692d.filesusr.com/ugd/f4b4ca_fac37e026b334f47a729ff0da6a421ef.pdf?index=trueIn PDF document text
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_4b8967c4cfb2426d8b2980e2dc4223d5.pdf?index=trueIn PDF document text
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_35ad7222cff54f818d405e43b18744f7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vexeliku/likala.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/encounter_shankar_movie_300mb.pdfIn PDF document text
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_57d1edfcbc164096bd3e42c130d442d6.pdf?index=trueIn PDF document text
    • https://c7fb3737-a2fb-4e06-b71d-f78b648bb0a4.filesusr.com/ugd/a9248e_39f7b937ba1b45948d9872301fc356c8.pdf?index=trueIn PDF document text
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_a11f7121857f446a8dc1ddb0d2d2a2c2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/womirofop/mr_bean_cartoon_videos_free_3gp.pdfIn PDF document text
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_c04215ec945c476fb5708241a632385e.pdf?index=trueIn PDF document text
    • https://025b4bf0-2906-4f5f-8a0f-6d4b68fc9518.filesusr.com/ugd/148ee2_cbc1c8ae369741c8964f37be91129121.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC22 5324 bytes
SHA-256: 2e001b7782b836aaa3fccd40a3f9e8e0821ab261d9369e7a77385ad6605be19d
font_01_sfnt_off00010e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E58 10924 bytes
SHA-256: 756327b7792506781ec4cc22fc0c2d01d99f3f05dcc1af4b2582151ea8067ceb
font_02_sfnt_off00013401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13401 16036 bytes
SHA-256: 52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550

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