Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e1378b6591e27a…

MALICIOUS

PDF

81.8 KB Created: 2021-03-26 13:13:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 61b6e3eae400f2935d1d2d19626d985e SHA-1: 7557d4a3def2f47d0471f9000f61b6d8fcfb21bc SHA-256: b4e1378b6591e27a1da1ebbe9eb99c5e7cfafed20297e8e0607dfd9a5e0d3773
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, potentially exploiting PDF vulnerabilities or serving as a lure for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/award?keyword=ada+diabetes+guidelines+2020+pdf PDF link annotation
    • https://cdn.sqhk.co/nivunufozub/bifjaii/lomamepitewazu.pdfIn PDF document text
    • http://sosed.market/how_to_make_a_lash_training_manual7916e.pdfIn PDF document text
    • https://cdn.sqhk.co/pasojixaju/GLFvjdq/the_last_of_us_remastered_ps4_wallpaper.pdfIn PDF document text
    • https://cdn.sqhk.co/gibuzini/CsmX8he/optical_illusion_tattoo_on_head.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/divergent_book_series.pdfIn PDF document text
    • https://motodamoz.weebly.com/uploads/1/3/1/4/131452818/soronigufi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369917/normal_6023e368e6338.pdfIn PDF document text
    • https://sukifife.weebly.com/uploads/1/3/4/3/134334287/7098517.pdfIn PDF document text
    • https://sojabejob.weebly.com/uploads/1/3/4/8/134890412/3247878.pdfIn PDF document text
    • https://cdn.sqhk.co/dagedazi/vSAhjbD/79092495719.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502833/normal_605a77399f1a3.pdfIn PDF document text
    • http://zumewidife.mygamesonline.org/gakorek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452609/normal_603fff258ccdc.pdfIn PDF document text
    • http://minuduw.22web.org/the_exorcist_tv_series_season_2_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466368/normal_602044b7c5c57.pdfIn PDF document text
    • http://moreprodukti.com/ipod_nano_7th_generation_bluetooth_specsf06by.pdfIn PDF document text
    • http://baramijotafexo.mypressonline.com/xenifexubiwabimozodokamo.pdfIn PDF document text
    • http://vevufilusik.scienceontheweb.net/42468462715.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mevusajilitum.rf.gd/netodo.pdfIn PDF document text
    • http://mibofive.epizy.com/winufigazonozor.pdfIn PDF document text
    • http://vamudeb.epizy.com/hearsay_exceptions_cheat_sheet_federal.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_off000100a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A3 5516 bytes
SHA-256: 632d5c8c1f3b2c45da6cf424cb4ef48a0785ec54289c31c8f98ab424d7ea8e70
font_01_sfnt_off00011374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11374 11432 bytes
SHA-256: f1d77ea359ac6fa485ea9425b865255f82094d350c389a774c55a440cf84c86b

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