Malicious PDF — malware analysis report

Static analysis result for SHA-256 81194a7a6b1cc144…

MALICIOUS

PDF

66.2 KB Created: 2021-01-06 16:22:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: a8e85bb666ef76a52d9cb267875e6d24 SHA-1: e9ad3eadf16f7267ff3042a1d1710a08ad3f9ff1 SHA-256: 81194a7a6b1cc144543e4c6e3f11d7755c4b25a2628553624caf3dd7334a9020
222 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirectors and link farms, indicating a phishing or malware distribution campaign. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a link to ggraff.ru, which is known malicious infrastructure. The presence of a 'download button' lure further supports this malicious intent. No scripts were extracted, but the overall structure suggests a link-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ggtraff.ru/aws?utm_term=chammak+challo+dj+remix+song+free In PDF document text
    • https://zuwukozoxuwiged.weebly.com/uploads/1/3/4/7/134713444/2d621639bc474c.pdfIn PDF document text
    • https://gukusabijimesop.weebly.com/uploads/1/3/4/7/134761354/sitajakavefema_vimefupofok.pdfIn PDF document text
    • https://cdn.sqhk.co/busosuwik/giTojdn/wheel_of_fortune_game_show_today.pdfIn PDF document text
    • https://roninuvanajeg.weebly.com/uploads/1/3/1/3/131379749/9360995.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/82e34575-ac8b-4a86-a773-4166068b02ef/jumping_frog_jubilee.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11916dfa-5b2e-4d2c-862f-04a7ad58b3a3/pen_and_ink_drawing_a_simple_guide_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/lanowifegowuwakaxolel.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/23998082903.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/computer_screensaver_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/298eb916-fcba-4d06-8322-36aa11f1e6fc/verizon_channel_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/fate_grand_order_gudaguda_event_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d1d913b-91f6-4d39-85a9-859edc2f6898/canonical_form_of_elliptic_pde.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/calendar_2019_india_word_format.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/fozefotif.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_off0000c460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC460 5548 bytes
SHA-256: cf897c40ab2c5b905c5922893e9287a90266d78d01a18cd105fe89c45bdc6bd3
font_01_sfnt_off0000d713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD713 10788 bytes
SHA-256: 4c7257c53b7c6ce02f2f57f5db66d023f6ad782caadc2cc3fdc4a14adb166490

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