Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d5bb3e0fe76d19…

MALICIOUS

PDF

91.2 KB Created: 2021-04-16 18:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a9f4cc298f9c0068cb6313aadca4a003 SHA-1: 87315c463bedcbfcb3b934d95abbc4a090e50406 SHA-256: f4d5bb3e0fe76d19da6264614601e945a62f09a072f1a71a466f09aacf008866
214 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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 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=what+does+the+boy+face+emoji+mean+on+snapchat In PDF document text
    • https://gadetuzajuvi.weebly.com/uploads/1/3/4/8/134850054/d23790559a037.pdfIn PDF document text
    • http://naxuvazexipok.sportsontheweb.net/59446513901.pdfIn PDF document text
    • https://nonadokemiraf.weebly.com/uploads/1/3/0/9/130969568/powerurejuxu_xuxuxi.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/pasawe/progressive_muscle_relaxation_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db6f33e3-eb51-40e5-aa94-b0870791d42a/what_is_a_good_man_poem.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/florida_utility_bill_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/845e5911-16e3-4ee7-89eb-198b5f9c9ed1/25532827870.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/edgenuity_answers_us_history_a.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/suwutowisimogogafebosopam.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/how_much_does_a_pr_professional_make.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee817b82-89e0-4534-9182-13fe70ff8f6b/36818582264.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/duty_to_god_scout_requirements.pdfIn PDF document text
    • https://s3.amazonaws.com/natewared/que_es_eficacia_en_administracion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/608351d1-8c15-4db4-8976-7191e40980e6/wd_my_cloud_mirror_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90e91d40-9d6a-4d65-83d6-8a63457b1679/tefumabowozufeve.pdfIn PDF document text
    • http://weparaxopulo.atwebpages.com/charlie_and_the_chocolate_factory_online_book_with_pictures.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68bc63fc-329f-49c8-9fa3-136384c6c517/ma_new_driving_license_rules_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/59649224018.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/10251988228.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9242332d-ccc9-48b8-8263-a0b67459d98c/comcast_arris_sb6121_compatible_based_on_filters.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/30cm_by_30_cm_in_inches.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95C 5596 bytes
SHA-256: 2e5e3c2bcfa65cc86c2fb1644a3c107946d09a4b70f1a591ada9f56c3d027996
font_01_sfnt_off0000fc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC54 12988 bytes
SHA-256: 5427b4824c5a845684dea941f8d0f4759f06976bb4966e4ae69ffe6e6d7af3b2
font_02_sfnt_off00011f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F63 11332 bytes
SHA-256: 918bd6b42d3cf48131012e0aae438f264ae3dc74d82f9a5042dbb0038633ea66
font_03_sfnt_off000145e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145E5 16728 bytes
SHA-256: 6df40c2c78412f5178d5eeaf67375214f662002796f683e08f8a95ea6a5bb082