Malicious PDF — malware analysis report

Static analysis result for SHA-256 3adbfd698fd961b5…

MALICIOUS

PDF

73.3 KB Created: 2021-03-30 01:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 82ff1db21deaa8f5bdde239ff8dbbe68 SHA-1: 8e5d3949c2d60c812eade28bd1004025f5e8e8b4 SHA-256: 3adbfd698fd961b52e66f387379b7a89b82be078e3d55dbf3a81c7bf37dbcc09
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external links, including a link farm on disposable hosting, suggests an attempt to redirect users to malicious content or phishing sites. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea that the document is designed to trick users into downloading something.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lozipotod.ru/award?keyword=caterpillar+identification+chart+pdf PDF link annotation
    • http://newidowakev.22web.org/bonafide_certificate_for_school_students.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453579/normal_5fe20e1d97e5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412758/normal_6050adbcd8c2f.pdfIn PDF document text
    • http://xitewenu.22web.org/51575140855.pdfIn PDF document text
    • http://gisaxisiburu.66ghz.com/nosusaj.pdfIn PDF document text
    • http://tezoxefakalexo.sportsontheweb.net/insert_file_in_excel_cell.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gixopiv.onlinewebshop.net/how_to_operate_the_power_pressure_cooker_xl.pdfIn PDF document text
    • http://fefemegazo.rf.gd/sirokawabuzowokisadata.pdfIn PDF document text
    • http://lexekuduwowig.atwebpages.com/aluminum_anodizing_process.pdfIn PDF document text
    • http://bumazuk.rf.gd/javax.pdfIn PDF document text
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_2c242788d678456ebbff66673f48a34a.pdf?index=trueIn PDF document text
    • https://5862e4ea-63a6-4c92-af93-e06d02d1a664.filesusr.com/ugd/eaa371_43c21a7d65f64a2e9fc05cc36a756316.pdf?index=trueIn PDF document text
    • https://d848e4b6-662b-4424-a759-963270729452.filesusr.com/ugd/30e015_68af074cdfa844eaa4ef17edb94f07f0.pdf?index=trueIn PDF document text
    • https://8d9f32f1-468a-4e6e-8fd0-236262902e57.filesusr.com/ugd/28860c_9a671441b2f341eead47182d2ec3e017.pdf?index=trueIn PDF document text
    • https://13cfbe10-32e4-4d7a-9072-8dbd3280e6b8.filesusr.com/ugd/994e9e_796d485fec7b417a8c96f979e8c68d63.pdf?index=trueIn PDF document text
    • http://borovob.epizy.com/java_8_streams_cheat_sheet.pdfIn PDF document text
    • http://gejebegujisutil.rf.gd/vimapajikapeduvesi.pdfIn PDF document text
    • http://fonumelipo.rf.gd/4858798501.pdfIn PDF document text
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_150933d89c8c4038b8df4f79d5519f95.pdf?index=trueIn PDF document text
    • http://doriponesarom.myartsonline.com/skyscan_atomic_clock_manual_86715.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_off0000e24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24A 4968 bytes
SHA-256: 9f62a753327433fe89f5c028f269e0d1936360ca2fdab8397ae4e366a36dcd5b
font_01_sfnt_off0000f329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF329 11404 bytes
SHA-256: 585147d7f57d598fbad21c95645250beb2b8ade39bb6bdadf67e682f2803f67b

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