Malicious PDF — malware analysis report

Static analysis result for SHA-256 107079f3ef2ff0ec…

MALICIOUS

PDF

86.5 KB Created: 2021-04-19 23:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 67ea16d74aba16697be956d76f470037 SHA-1: cec1d81c807ef9d006d4940de0c9c4da791c82d5 SHA-256: 107079f3ef2ff0ec0e26dcabb090bc80baf178a0034aa24efa904357c51fde69
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be related to the novel 'One Hundred Years of Solitude', likely used as a lure to direct users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nipisod.ru/strik?utm_term=frases+mas+importantes+de+cien+a%25C3%25B1os+de+soledad PDF link annotation
    • https://razezoxuwen.weebly.com/uploads/1/3/1/4/131453099/9986353.pdfIn PDF document text
    • https://kapizufon.weebly.com/uploads/1/3/4/4/134486886/wufufufem.pdfIn PDF document text
    • https://tevomijirurefo.weebly.com/uploads/1/3/4/8/134846864/444471.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412894/normal_605ac1bf25628.pdfIn PDF document text
    • https://rasafidi.weebly.com/uploads/1/3/0/7/130776861/wimawodobopa_mamujagivak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424996/normal_605d020a0a042.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484814/normal_606d8d375f2a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367665/normal_601733da1bcd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378379/normal_6019e00d1495b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384143/normal_5ff50b3e9de90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425237/normal_606da7f6d4af5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403131/normal_5fdea574c71f3.pdfIn PDF document text
    • https://femovoba.weebly.com/uploads/1/3/0/7/130775826/1844416.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454562/normal_600c7085b340c.pdfIn PDF document text
    • https://tanofome.weebly.com/uploads/1/3/5/3/135316841/wewudowip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402000/normal_60569192a57ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381751/normal_5fe9b2a700cdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421764/normal_6054bcab1fd3c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/befafuni/dinuwi.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/wezefewe.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/authentication_problem_wifi_tablet_android.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/army_writer_counseling_failure_to_report.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/559728299.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_off00011049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11049 5384 bytes
SHA-256: 502c51a3ea2fcdc4b2360b8b51973a9bb5afe37c7b040c3eff031ec4df6e9a5b
font_01_sfnt_off0001223e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223E 12312 bytes
SHA-256: c1f21e115fea2bb2e89d08d9714c142aeebc96a090c10ebc95e5079689529755