Malicious PDF — malware analysis report

Static analysis result for SHA-256 6413176848b0fb69…

MALICIOUS

PDF

80.5 KB Created: 2021-03-06 01:16:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3e87c0bf507f0adc968979a50820b44d SHA-1: 232fd3e10963f7d822838f31b1cdd9dd5d278475 SHA-256: 6413176848b0fb69430516e860540127eef5a5e664b41c588babaf3402865a6c
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to search queries or document titles. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=how+to+say+a+book+title+in+mla In PDF document text
    • http://jojazinex.mygamesonline.org/baby_g_shock_pink_watch.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469136/normal_603b776df2a68.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476954/normal_5fcbf1c59407a.pdfIn PDF document text
    • http://fidofawi.medianewsonline.com/kudavujokega.pdfIn PDF document text
    • http://playmarket-online.com/rikofilakoliyvyic.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369191/normal_5fda70bf9c5cb.pdfIn PDF document text
    • http://walletelectrum.buzz/fekoga3dxy3.pdfIn PDF document text
    • https://xajimago.weebly.com/uploads/1/3/0/8/130813364/lopemojalogotawexi.pdfIn PDF document text
    • http://zawopim.mygamesonline.org/gijisesewanaxibiraxiba.pdfIn PDF document text
    • http://xasedogamif.mypressonline.com/how_to_merge_files_in_foxit_phantompdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446645/normal_603e181606435.pdfIn PDF document text
    • https://vugadeji.weebly.com/uploads/1/3/1/4/131406436/e35067e6c0ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374848/normal_5fe2de7a3ef95.pdfIn PDF document text
    • https://jiranunurojowoz.weebly.com/uploads/1/3/1/8/131860868/kagewoxewen.pdfIn PDF document text
    • https://buvonumonub.weebly.com/uploads/1/3/5/3/135304713/9773337.pdfIn PDF document text
    • http://avtoshtorki.shop/android_programming_the_big_nerd_ranch_guidefc5ey.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zemipajobo.rf.gd/everstart_jump_starter_1200a_troubleshooting.pdfIn PDF document text
    • http://zikoliduxa.atwebpages.com/57395502014.pdfIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_a4571ab17f874d9082bc6f84b869b6aa.pdf?index=trueIn PDF document text
    • https://01ff271a-2d66-4e22-ac0f-a796646d2f56.filesusr.com/ugd/8d93e9_05c99778cdbb4d50a4f0efbb3b512699.pdf?index=trueIn PDF document text
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_5c201cad18844788a6ade6f6e4ec63c6.pdf?index=trueIn PDF document text
    • http://pavitekoruw.rf.gd/bevuxu.pdfIn PDF document text
    • http://mogorir.epizy.com/gulexirirologupufuvike.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_off0000fd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD46 5096 bytes
SHA-256: a66cb44f6e2557db5c3cdc0426e3d41f9715821645a7bdbf7f9171f67c2931e9
font_01_sfnt_off00010ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA3 11284 bytes
SHA-256: 8c6750988923a76234a27a9e893086e2e780dd064c23b0d28ebbcc1de3e324c9

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