Malicious PDF — malware analysis report

Static analysis result for SHA-256 d49fcf9c729df2a1…

MALICIOUS

PDF

75.4 KB Created: 2021-03-24 20:59:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: afc261ea0c867ebdad5ba5c8e8c5ccc9 SHA-1: 893870332fc9935b92d3f5db87afd0eaa86a9c2c SHA-256: d49fcf9c729df2a1b342f8a7d17ad7769904239347c2fdf5c89d1a4052973544
254 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirection and a link farm, with critical detections from ML classifiers and ClamAV. The embedded URLs, particularly 'https://dafemum.ru/wix?keyword=eldest+pdf+online', are identified as malicious redirectors. The document body, though heavily obfuscated, suggests a lure related to 'eldest pdf online'. No scripts were extracted, but the PDF structure itself facilitates redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/wix?keyword=eldest+pdf+online In PDF document text
    • http://besenejusa.iblogger.org/gataxigifikawuva.pdfIn PDF document text
    • http://xatubaxo.iblogger.org/cof_ic_full_form.pdfIn PDF document text
    • https://vovamujif.weebly.com/uploads/1/3/5/3/135318660/bikotamukob-rasogigijon.pdfIn PDF document text
    • https://gijidibeb.weebly.com/uploads/1/3/4/7/134702067/6767608.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xofivijisaja.rf.gd/gaxunumafakonafubujesakor.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/octopus_app_apk_ios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ede5af3c-8926-43b8-ba3d-2f8790b13dea/grammar_and_punctuation_worksheets_high_school.pdfIn PDF document text
    • http://noxudabewoxedit.rf.gd/handwriting_practice_sheets_for_kindergarten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e12d222-901b-4bfa-8cd5-c8f5c26362b5/mathematics_worksheet_for_grade_5.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/dotulibopewir.pdfIn PDF document text
    • http://kojodidekojamu.rf.gd/how_do_i_get_my_tracfone_pin_number.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/bobaluwut.pdfIn PDF document text
    • http://durunorutap.epizy.com/82193833041.pdfIn PDF document text
    • http://fizifar.epizy.com/wajimuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2705445-abc6-43b9-a664-41727feba426/is_kenmore_sewing_machine_385_low_shank.pdfIn PDF document text
    • http://fonajuwowo.epizy.com/zudewepiwamu.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/change_label_template_existing_word_document.pdfIn PDF document text
    • http://gofosuxubajo.epizy.com/free_email_signature_template_for_gmail.pdfIn PDF document text
    • http://zupifimiture.rf.gd/foxuvesan.pdfIn PDF document text
    • http://xiramegakasivi.epizy.com/stardew_valley_legend_fish_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/12237724583.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b08a717-0732-40a1-9813-01749f770e2d/dell_inspiron_n5010_core_i3_drivers_free_download.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_off0000ed11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED11 4684 bytes
SHA-256: b5a6f74464033b4ee78fb9588de77d48162d0108270576cf7c731c7680373193
font_01_sfnt_off0000fd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD19 10420 bytes
SHA-256: 17b08b2d149de1f9bbcd7cb55062191d707a799d367332fcdc86000c6647b23e