Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dbb7234549b26ca…

MALICIOUS

PDF

83.3 KB Created: 2021-03-21 20:57:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b06370dd68e7792609007f30f06ed807 SHA-1: 92f89e403d9abaf707b01132e66f3efd2f0da432 SHA-256: 7dbb7234549b26ca4cc05f9210c16baaaa3985992ce3b16057f43bd61eb16875
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable domains, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are commonly used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • 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
  • 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/strik?utm_term=how+to+say+yes+please+in+french
    • https://cdn-cms.f-static.net/uploads/4496616/normal_601b4d0744726.pdf
    • https://cdn-cms.f-static.net/uploads/4411937/normal_6031806db4bb4.pdf
    • https://cdn-cms.f-static.net/uploads/4476015/normal_604849eb151c1.pdf
    • https://cdn.sqhk.co/falugojafat/iReghfQ/firipoxawelutosipe.pdf
    • https://cdn-cms.f-static.net/uploads/4417418/normal_5fd8d7d7232f6.pdf
    • https://vewirorerisemi.weebly.com/uploads/1/3/4/6/134627211/sovagapageri.pdf
    • https://cdn.sqhk.co/dibirolinu/HYeUjgk/mero_sansar_ma_cg_song_mp3_download.pdf
    • https://tizelizenofus.weebly.com/uploads/1/3/0/7/130740364/1168032.pdf
    • https://cdn.sqhk.co/sibamoxa/ojbhiNC/88480318734.pdf
    • https://static.s123-cdn-static.com/uploads/4393644/normal_5fc9e205b00fb.pdf
    • http://rusagobaloregir.22web.org/love_quotes_images_in_malayalam.pdf
    • https://cdn-cms.f-static.net/uploads/4405206/normal_60458a97c1de2.pdf
    • https://static.s123-cdn-static.com/uploads/4459318/normal_5fcfa31b6dab4.pdf
    • https://wimofitadaxota.weebly.com/uploads/1/3/4/3/134362004/rakapi.pdf
    • https://cdn-cms.f-static.net/uploads/4443588/normal_603101c89b8bf.pdf
    • https://static.s123-cdn-static.com/uploads/4454184/normal_5ffd9a2d09ef5.pdf
    • https://cdn.sqhk.co/xagaxubibiz/iXsntie/download_battle_craft_survival_mod_apk_revdl.pdf
    • https://cdn.sqhk.co/figotabam/CfThij5/the_oregon_trail_american_settler_apk.pdf
    • https://xetinize.weebly.com/uploads/1/3/2/6/132695894/dopokibutuvutav.pdf
    • https://milorali.weebly.com/uploads/1/3/5/9/135965765/c56a42e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gufesabil.rf.gd/wavajuku.pdf
    • https://a001dc82-f31e-4944-9b76-0a8e602b6855.filesusr.com/ugd/e4ee87_698c0a0fcca74d3bbdd49f4083a69bd0.pdf?index=true
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_13bab0d45f9c4e63942c1c1a20433ec1.pdf?index=true
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_ce7e1037f12741fca7071a7294127c04.pdf?index=true
    • https://6f2fb29c-15f2-4b08-b525-3eb91a7f0a41.filesusr.com/ugd/c3548c_364dd71fb5f040c3b60af99de7a313ec.pdf?index=true
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_ee3d29eba84641b59a7a22a021df9c8d.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
    • 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_off0000ef87.bin
9943b9a3653e1eea27147c025054b0f278f32cba32c25c9b3bd47caff3f49401
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF87 5260 bytes
font_01_sfnt_off0001017b.bin
391454bd7a6a21111fbffccde5797312e62b0d6f08e16d38326f103ed7028034
pdf-font-stream PDF embedded font (sfnt) at offset 0x1017B 12648 bytes
font_02_sfnt_off00012a75.bin
b87f97ee19d0eebf852dd88b0ab32469aeb165aad349e9abc0ff3cff3eb64326
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A75 16068 bytes