Malicious PDF — malware analysis report

Static analysis result for SHA-256 007b6b95f77a55a6…

MALICIOUS

PDF

78.1 KB Created: 2021-05-28 05:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5f13c3c67cfa89ce47f1363865ed47da SHA-1: 75f82e89e323f7eba10b3a0bf87e9a08eeb7f766 SHA-256: 007b6b95f77a55a6ef689a9ff3fbc93f013bb4b5677e0224c8e6c3938f01ac6d
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity.

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://vilenefex.ru/strik?utm_term=fundamentals+of+nursing+the+art+and+science+of+person-centered+nursing+care+9th+edition PDF link annotation
    • https://wewiloviwa.weebly.com/uploads/1/3/4/5/134585183/2301563.pdfIn PDF document text
    • https://bemiredo.weebly.com/uploads/1/3/5/3/135322707/7597475.pdfIn PDF document text
    • https://ladulokepalixu.weebly.com/uploads/1/3/4/8/134878898/6fe2485.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497093/normal_6020c215af871.pdfIn PDF document text
    • https://nozukevanof.weebly.com/uploads/1/3/5/3/135392293/11d6f4.pdfIn PDF document text
    • https://zefijevizo.weebly.com/uploads/1/3/2/3/132302816/vezexukafu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461211/normal_6035b42f7844f.pdfIn PDF document text
    • https://suwanozafedo.weebly.com/uploads/1/3/4/5/134587456/9216014.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445866/normal_605060acdc5f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501503/normal_603bf396bd60f.pdfIn PDF document text
    • https://pupaxuge.weebly.com/uploads/1/3/4/0/134096873/3585042.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427282/normal_5ff042f52539c.pdfIn PDF document text
    • https://jotajawe.weebly.com/uploads/1/3/1/6/131606146/01b66355ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458634/normal_6053b4c8d959a.pdfIn PDF document text
    • https://pefemodadiz.weebly.com/uploads/1/3/4/5/134520562/tojumulalev-wigewolako-tozotajofuz-mozamijojik.pdfIn PDF document text
    • https://nonovobuzodeku.weebly.com/uploads/1/3/5/3/135348203/670f3db3b6965.pdfIn PDF document text
    • https://wavoxodasamemat.weebly.com/uploads/1/3/5/3/135348105/729997.pdfIn PDF document text
    • https://ribapapa.weebly.com/uploads/1/3/4/4/134479292/pozikuvofivosu.pdfIn PDF document text
    • https://finoritibad.weebly.com/uploads/1/3/4/4/134468058/zujelezope.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374002/normal_601dd46369f7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460071/normal_605db00bcaf58.pdfIn PDF document text
    • https://dowusasetitemej.weebly.com/uploads/1/3/4/3/134307927/didadigisenena-lijaruvofag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365636/normal_5ff9d795d721f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415951/normal_5fee82d3f2603.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000efcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCC 5712 bytes
SHA-256: ee94ae2f107a91614123f4239d7d6ec758eeab13b63d71c8fb32214248e31ff9
font_01_sfnt_off00010319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10319 11256 bytes
SHA-256: 7b96c5a6d99fa33ce5379f9678418f494bbb33dbb0eef01976a59580b8e96e10