Malicious PDF — malware analysis report

Static analysis result for SHA-256 af691880a4b59628…

MALICIOUS

PDF

74.9 KB Created: 2021-02-03 01:21:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 76a58c04dec7ec14aa5329b3569d21d2 SHA-1: b1f8eb943f4474e0b58973d196fa796e4921e0aa SHA-256: af691880a4b59628aae3ad438f64f4e6056771850cd9f73b5751706855abb5f5
194 Risk Score

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.
  • 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://yafferge.ru/aws?utm_term=cours+d%2527+anglais+alphabet+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4457881/normal_600f329c612ea.pdfIn PDF document text
    • https://cdn.sqhk.co/tukawezezo/7qifhaZ/sasokulisinawodobafa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454990/normal_5fee47c12c38e.pdfIn PDF document text
    • https://cdn.sqhk.co/pulafefer/duY8aSm/xizuj.pdfIn PDF document text
    • https://cdn.sqhk.co/ferorigife/ZIbjdUj/sky_force_reloaded_2_planes.pdfIn PDF document text
    • https://cdn.sqhk.co/ritasuxa/MhcrjjR/gas_prices_near_maple_grove_mn.pdfIn PDF document text
    • https://cdn.sqhk.co/zenekukera/SKjghie/xikek.pdfIn PDF document text
    • http://jotusuwes.iblogger.org/54474939445.pdfIn PDF document text
    • https://cdn.sqhk.co/rajunakeb/1FzooKi/cm_rewards_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuwosuz.rf.gd/89733095108.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/44763674737.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/finding_slope_and_y_intercept_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/difference_of_two_squares_worksheet_tes.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/ip_address_scanner_free.pdfIn PDF document text
    • http://lotirejotan.rf.gd/degaborixowurajuwuwesujul.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_off0000e20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20B 5384 bytes
SHA-256: af29d8cbe8dfafd5903fc5a1428b79783c871a1da9087bb87fc7e4af24b671a4
font_01_sfnt_off0000f44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44F 13064 bytes
SHA-256: 3b2c571abd08fb0cf9736527a6e5c2f357706ab8746945501459793bd2e3e069