Malicious PDF — malware analysis report

Static analysis result for SHA-256 44b61a203f5dcdf2…

MALICIOUS

PDF

78.8 KB Created: 2021-02-13 00:28:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 4651d0bc9f96f82e8772d074ed1933c8 SHA-1: fa6e07496d1218258838feff7a3aba5c2b6e94f9 SHA-256: 44b61a203f5dcdf2159dee368c56dd07add62baf1b6ca70495087ffc64a964c5
244 Risk Score

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/123?utm_term=new+hampshire+resorts+on+the+water In PDF document text
    • https://tobivuzulukimu.weebly.com/uploads/1/3/1/3/131384599/7bc5f8cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451045/normal_5ff7ff715c933.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376606/normal_6025c2b87e48f.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/cCdieNO/goalkeeper_blitzcrank_worth.pdfIn PDF document text
    • https://nivunosanogerog.weebly.com/uploads/1/3/4/5/134516177/1b34ba2a1da6.pdfIn PDF document text
    • https://sididipukiwe.weebly.com/uploads/1/3/1/3/131398020/vigapab.pdfIn PDF document text
    • https://cdn.sqhk.co/pefevepufi/jiYbifB/triple_rush_kh3.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwoxebu/dkvhhYT/dusovotetekekuxobaj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450632/normal_5ff54e37c1232.pdfIn PDF document text
    • https://gojojiwegojefuw.weebly.com/uploads/1/3/2/6/132695574/maxuvoti_vanixusuzotowo_gozoselu.pdfIn PDF document text
    • https://cdn.sqhk.co/tinipuded/QZjcuq1/31315674108.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385028/normal_60238f3fa08db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480142/normal_5febce35e197a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412154/normal_601491816a915.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kovawasokagi.epizy.com/banjo_all_song_mr_jatt.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_off0000f5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C5 5088 bytes
SHA-256: 911999a5ea59c07f06ccf46413ce341fa2bd4d7a11dc9029ca0941a156e1149f
font_01_sfnt_off000106fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FB 11756 bytes
SHA-256: 2c44f495c700083a0d7a1f7f1f938a11f5e22c6f34d6092383b932298520544e

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