Malicious PDF — malware analysis report

Static analysis result for SHA-256 bde0403279c0afb8…

MALICIOUS

PDF

105.2 KB Created: 2021-06-05 08:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e99a7e591a76138df5907cf455f2df8c SHA-1: dff5cd884f42fb66a701235a11fa76cb8bbae25e SHA-256: bde0403279c0afb836d276395f3b9ecfc1b9eeef0dc7913e722c7b22c593bca9
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://soxebez.ru/123?utm_term=alsea+bay+salmon+fishing+report PDF link annotation
    • https://razisosip.weebly.com/uploads/1/3/0/7/130739291/0993d18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378605/normal_60483f7e60dea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390068/normal_6024165d59282.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374839/normal_6019764a676aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471091/normal_603f0f6e8ce2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385617/normal_601980ad71964.pdfIn PDF document text
    • https://pixogupegitof.weebly.com/uploads/1/3/4/5/134592450/rukigine.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383703/normal_5feeb857d797b.pdfIn PDF document text
    • https://memekofonaw.weebly.com/uploads/1/3/6/0/136054412/tojenuko.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381964/normal_6004c2d85531c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370309/normal_5ff5007e646be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365583/normal_60161130afef4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419205/normal_606ca649b0fd1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379359/normal_5ffc677206952.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393488/normal_602777221f5df.pdfIn PDF document text
    • https://zalewuko.weebly.com/uploads/1/3/4/6/134604420/fukajosafasinokujune.pdfIn PDF document text
    • https://koponabunabo.weebly.com/uploads/1/3/4/5/134520941/f35b7d15cea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495841/normal_6035d26c83eab.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/de755cab-2cf7-4325-9be3-5a97dcdfabaf/the_living_bible_large_print_online.pdfIn PDF document text
    • http://wuvebag.pbworks.com/f/13268679049.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c21026bd-7057-4681-a986-03146724cc26/is_distance_bracelets_legit.pdfIn PDF document text
    • http://paditoxef.pbworks.com/w/file/fetch/144562908/how_do_you_write_a_formal_letter_to_a_manager.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/410c9119-6f04-4db7-bb95-37bdab8329b4/66615048256.pdfIn PDF document text
    • http://jajafad.pbworks.com/w/file/fetch/144419145/suvarudezi.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_off00015e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E6C 5544 bytes
SHA-256: 4f7959dcd5a6ee34bafd84e97b3fb8634d018b1bb5c828e7416d67738c9ecb5e
font_01_sfnt_off00017129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17129 11308 bytes
SHA-256: 0b837f3643a215fdaa13c17337e8f899b47ede4a161bc626e19eb2c069cac576