Malicious PDF — malware analysis report

Static analysis result for SHA-256 93e2312aa125d40b…

MALICIOUS

PDF

88.4 KB Created: 2021-04-01 08:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 0dbadda8f513b852d6f47165ec9c63aa SHA-1: 8e1a98732f5e356bdaccea9506824fcb26a25248 SHA-256: 93e2312aa125d40bcd60741f3a149b1545be33760176af4a1fc148af147e9ec1
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with critical heuristics identifying it as a malicious redirector and part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO abuse. The document body, though heavily obfuscated, contains metadata related to PDF generation and a keyword that might be part of a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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/award?keyword=anticonvulsivantes+en+pediatria+pdf In PDF document text
    • http://getsol.xyz/dd_5e_epic_level_handbookbt3tm.pdfIn PDF document text
    • http://raicen.com/jokumezejofikoxymilw.pdfIn PDF document text
    • http://hook-up.fun/plantronics_voyager_legend_not_working_with_skyper6sws.pdfIn PDF document text
    • http://garantiya62.ru/diccionario_ingles_espaol_gratis_sin_internetkbz9t.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://32e47638-7206-44c1-ad53-5c6f9176402e.filesusr.com/ugd/e00742_d30b6f7101704685af7d683a564ac46a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/war_of_the_worlds_2005_tripod_types.pdfIn PDF document text
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_35ebb0a9b5cf4481b1dc35bd134c9d33.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/algebra_questions_for_class_7.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/pride_and_prejudice_chapter_16_summary_sparknotes.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/jobalawa.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/degebixobed.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/96181996964.pdfIn PDF document text
    • http://vipaviveza.epizy.com/jotilipaluzabe.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/81337731993.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/professional_soccer_betting_tips_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/ek_bar_aaja_raja_song.pdfIn PDF document text
    • https://s3.amazonaws.com/nojemi/azureus_free_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/concepto_de_anemia_ferropenica.pdfIn PDF document text
    • http://fipodumogom.epizy.com/kuganafufim.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/my_positive_attitude_meaning_in_hindi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6D 1636 bytes
SHA-256: 017610d6375b55fa83a2b778971da46bfa2556f9e26f9584b555d06809bb30fe
font_01_sfnt_off0001149a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149A 5196 bytes
SHA-256: fe5672303e657742b185bbb867d6c2e05459fa2e75263f32a63ecbcff54741a5
font_02_sfnt_off00012663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12663 13332 bytes
SHA-256: ed661011e23ada4986b208b591d13140d671be264e10826b3ebc6bfc5d053206

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