Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fcf3f20cc9229b8…

MALICIOUS

PDF

66.7 KB Created: 2021-03-29 08:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 30b558669816d0b47008c0da971872b0 SHA-1: aef771b9f6393627b4527cf88623aab4f18f7b87 SHA-256: 3fcf3f20cc9229b814830fc8adb2def6b0609f3d1caae5ac117601b978e3c4b8
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO manipulation or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites, possibly for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://baarspo.ru/wix?keyword=hell+is+empty+and+all+the+devils+are+here+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374185/normal_6020344762da1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412780/normal_5ff4d86e6b001.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474727/normal_5fe8c6c82c058.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447097/normal_5fe41ffecd941.pdfIn PDF document text
    • http://beruvutekimeged.22web.org/52627726558.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375357/normal_603ee9b045a0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449411/normal_602006e594c09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372377/normal_5feb042ee3e47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445324/normal_6052fc8d108ad.pdfIn PDF document text
    • http://togezapavux.iblogger.org/phenomenological_approaches_in_landscape_archaeology.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467298/normal_6051ae143720c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369185/normal_6005167baeabc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413243/normal_60279e6799179.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471082/normal_60189f3d33b1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410214/normal_604685ea7d017.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cf268418-7549-4780-9cff-e39e61b5276c.filesusr.com/ugd/0b1cf2_4d13713af15243a1ab86cf1c24203da2.pdf?index=trueIn PDF document text
    • http://tabezomen.epizy.com/management_of_anemia_in_pregnancy.pdfIn PDF document text
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_061e43b6838449aa910cd27632cfd04f.pdf?index=trueIn PDF document text
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_c412247248e24fa6a8385dcc1180d798.pdf?index=trueIn PDF document text
    • http://rakoduwe.epizy.com/ingenuity_baby_swing_user_manual.pdfIn PDF document text
    • http://gizuxotunofape.rf.gd/download_free_oxford_english_dictionary_offline_for_android_tablet.pdfIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_2db6e769f06d43dc99d67a355ec8fd77.pdf?index=trueIn PDF document text
    • http://mukesijurifa.epizy.com/abdomen_agudo_medico_2020.pdfIn PDF document text
    • http://niribulikebi.rf.gd/dragon_goggle_lens_color_guide.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_off0000c96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96D 5404 bytes
SHA-256: 0577538e25ef4578415abe362b86e494c86aa7fe24977c1212a0ea47750c0a1f
font_01_sfnt_off0000dba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA9 9900 bytes
SHA-256: 47cd0d3fbecba7abb59e048b77293cbc078efa7549d4b6d42e458bcde02f9dc4