Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0725ad998936c32…

MALICIOUS

PDF

78.3 KB Created: 2021-04-03 06:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 866c0f652999c93ec52a49b6eb0044da SHA-1: cdb0a1a45a297c52d5a766ed2cafeb9714efce57 SHA-256: b0725ad998936c32af80b9cb9956c2867191ab6c4437f20cf16d9c0d6f66f890
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, many of which point to external PDF files, suggesting a link farm or redirection scheme. One critical heuristic identified a link to known malicious redirector infrastructure, and another flagged the PDF as a link farm. The ML classifier and ClamAV also strongly indicated maliciousness, with ClamAV specifically identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/award?keyword=introduction+to+exploratory+data+analysis+pdf In PDF document text
    • http://voztrans.ru/letulisexiwavojcqd2h.pdfIn PDF document text
    • http://kadesevi.iblogger.org/fopogotudi.pdfIn PDF document text
    • http://useporte.xyz/47312507089nvvm.pdfIn PDF document text
    • http://hamlikjorettoop.ru/characteristics_of_descriptive_research_designmmn2u.pdfIn PDF document text
    • http://rukovofefiferiw.iblogger.org/xirogaxuguxomi.pdfIn PDF document text
    • http://fuzefimovogavi.22web.org/pixek.pdfIn PDF document text
    • http://shopyou.online/sizimg8jxn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/37fba58f-b379-411a-9406-bbdc022fbcaa/medutetafijuxofejogeri.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/29486751062.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/annadata_bengali_full_movie_mp4.pdfIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_7d83db3d8734468d84f9ce9ad2d91fb9.pdf?index=trueIn PDF document text
    • https://a95edb9d-21e5-46e4-bb1b-b1fdf66a5dae.filesusr.com/ugd/09e34a_046f4cc24b3d4eb1a58e9308fedb718a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bokelur/59429837227.pdfIn PDF document text
    • http://foboganezebalo.rf.gd/what_day_does_lisd_start_school.pdfIn PDF document text
    • http://bidadefaj.epizy.com/powerpoint_lesson_3_study_guide.pdfIn PDF document text
    • https://229c0a76-8cd2-4a6d-ad64-a548a1436bbb.filesusr.com/ugd/f9ed01_fa06d2d4554c4294946628514fe8918f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/70275e01-a2fe-46e6-a828-d984f1a83c6f/uppababy_vista_2018_stroller_only.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/search_icon_image.pdfIn PDF document text
    • http://valebuwevunav.epizy.com/zadudifofadenawivapekeji.pdfIn PDF document text
    • http://joxumokuri.epizy.com/amd_graphics_card_for_laptop.pdfIn PDF document text
    • http://xafewor.rf.gd/infrared_spectroscopy_principle_instrumentation.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/smadav_antivirus_free_latest_version_2019.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_off0000f517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF517 5256 bytes
SHA-256: 5f61b870c061ded4d9d7866f7de9141cea28fa64c9a1fe8bc0cdbefca9140657
font_01_sfnt_off00010714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10714 10728 bytes
SHA-256: 6d7fb6017a96a5972fd377521b93d0fdc8c4975385734122d448c0266b740641