Malicious PDF — malware analysis report

Static analysis result for SHA-256 fba16b63175025f4…

MALICIOUS

PDF

82.3 KB Created: 2021-05-25 16:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 28d1ebae8298c5bf6599c216d2caa792 SHA-1: 22e1dc82d7a872f4ddb456f8a483c300a2c84e80 SHA-256: fba16b63175025f4e0ce3b4ccdce378acdfd0ae62e5aaaed1fcdd93f90f388f4
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are flagged as malicious or part of a link farm. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically identifies a link to 'yafferge.ru' as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/strik?utm_term=pocket+guide+to+clinical+examination+4th+edition+pdf In PDF document text
    • https://wevepuxobufo.weebly.com/uploads/1/3/0/7/130776344/2201236.pdfIn PDF document text
    • https://gawujura.weebly.com/uploads/1/3/5/3/135325150/pelav-makufunogose.pdfIn PDF document text
    • https://navaraze.weebly.com/uploads/1/3/4/6/134682655/pulepalilezaba-salugifabegunot-vibanovuwunumob-bebixaduf.pdfIn PDF document text
    • https://nobarolibefo.weebly.com/uploads/1/3/1/4/131407117/devutodekofeb-dezof.pdfIn PDF document text
    • https://jotonude.weebly.com/uploads/1/3/1/3/131398177/5810684.pdfIn PDF document text
    • https://muxupodijem.weebly.com/uploads/1/3/4/8/134885552/75ef2e0.pdfIn PDF document text
    • https://sikiroradimer.weebly.com/uploads/1/3/4/6/134619363/lekojomotojufos.pdfIn PDF document text
    • https://dupudebokuvufex.weebly.com/uploads/1/3/2/3/132303235/53132c8bccf0505.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/xibosoduve.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/how_to_write_a_lab_report_biology_college.pdfIn PDF document text
    • https://s3.amazonaws.com/natewared/micro_expressions_lie_to_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a94b7d8-de76-4e48-8e09-5612c0130870/volume_formula_for_half_a_sphere.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c65056a-d162-4952-a84c-ed170354756f/wejogujitanegegemubipeler.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/best_place_to_buy_bob_stroller.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/break_dancing_videos_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/ants_go_marching_music_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c6321df-2910-4cb5-8461-94a975708b39/how_to_reset_pioneer_stereo.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/fatonajuzofos.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/vitinirexonoroxesewevu.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BF 5516 bytes
SHA-256: aee6b78dc7458da2813fa050a78e3b5daa79ae0e199342b9e9b3c7ef6348427a
font_01_sfnt_off0000fc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC74 11208 bytes
SHA-256: 870a0395c19b0c2d54f17091f4a8fee190073b071e45f05a55bee1b9959bea87
font_02_sfnt_off000122d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D1 16460 bytes
SHA-256: 10870da844573615f323bfd7084e94cc064fb5b63d2b27e01fb189e311c4e78e

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