Malicious PDF — malware analysis report

Static analysis result for SHA-256 af137b7bdee615b4…

MALICIOUS

PDF

74.7 KB Created: 2021-03-18 04:01:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e122dc5564a704ce231755fc773ff3ac SHA-1: 427a444fac90129f259eb76ee06211e2e34949fb SHA-256: af137b7bdee615b4b87e40d0b7d44600eb2addfaa29a79f35f8332eb33b5947c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly and other hosting services, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

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://ponafet.ru/award?keyword=low+back+pain+exercises+pdf+ortho
    • https://siragakepog.weebly.com/uploads/1/3/4/8/134890789/c28a7.pdf
    • http://torchqbfl.fun/28974047824ncryi.pdf
    • https://cdn-cms.f-static.net/uploads/4481663/normal_60371155c19a0.pdf
    • https://cdn.sqhk.co/golemejexeno/FZicmhe/anime_maker_app_from_photo.pdf
    • http://lemakomude.sportsontheweb.net/siledonomonanudajixebum.pdf
    • https://cdn-cms.f-static.net/uploads/4476274/normal_600caf4b5b5bb.pdf
    • https://kazirevuteguzug.weebly.com/uploads/1/3/2/6/132681824/3775677.pdf
    • https://xekukagakodepa.weebly.com/uploads/1/3/3/9/133999272/tiwegeboked.pdf
    • http://soldonlittleton.com/toto_s550e_washlet_w_remotegb7kz.pdf
    • https://nugivukowunel.weebly.com/uploads/1/3/4/0/134041243/gaxonido-wugizoworigunag.pdf
    • https://cdn.sqhk.co/dumotometapo/gnswDhe/animal_radiography_definition.pdf
    • http://usacreditreport.info/grafische_rekenmachine_ti-84_plus_ce-t_online8j7la.pdf
    • http://bumasujofoj.getenjoyment.net/how_to_work_lathe_machine.pdf
    • https://serorufadorulu.weebly.com/uploads/1/3/1/4/131483245/sivufek.pdf
    • https://juvarefuj.weebly.com/uploads/1/3/1/3/131398009/279259.pdf
    • https://fujokexa.weebly.com/uploads/1/3/5/3/135304253/3dbf840d304b.pdf
    • https://static.s123-cdn-static.com/uploads/4412761/normal_6000cb4d7f595.pdf
    • https://mabobuloxulekev.weebly.com/uploads/1/3/4/6/134692970/tilowusadukupod.pdf
    • https://cdn.sqhk.co/sizozizaj/cHiifij/rebutipir.pdf
    • https://cdn-cms.f-static.net/uploads/4377924/normal_60439433d7fc6.pdf
    • http://baditunabupiru.mywebcommunity.org/midoguxezeporinusat.pdf
    • http://bestpriceforukraine.xyz/83342657945twurm.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000e6d2.bin
51173f8dcbd42e5ab9575941bbc93247add8a93bb651de837643f2a29eb88d22		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D2 5516 bytes
font_01_sfnt_off0000f9a6.bin
d0a3ca90b929b73fa8c02b24e7ce3748befc252d04b74de4db76a7a888ffa24b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A6 10332 bytes

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