Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ac8643cb4cd95d…

MALICIOUS

PDF

79.7 KB Created: 2021-05-28 15:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f096e5fdc2fa101dbb39fa04ae29169b SHA-1: 5a75a9369da16d0488b4cccd8040c8ce5e095b66 SHA-256: 78ac8643cb4cd95dc575ab0d6bc8c6b6a2404380acf4dd0df71db73c76a93d97
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/strik?utm_term=how+to+fix+volume+on+fios+remote PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4428054/normal_6023d27b622c1.pdfIn PDF document text
    • https://kenafowipadile.weebly.com/uploads/1/3/1/4/131437871/zijisew.pdfIn PDF document text
    • https://nokemodikobo.weebly.com/uploads/1/3/4/3/134308311/2689104.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426262/normal_601d2b7d91eed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376086/normal_6024887ea5229.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458163/normal_6061b3f60726c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450632/normal_5fe5c32d946be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415304/normal_606dcb0bd960b.pdfIn PDF document text
    • https://roxasudafuj.weebly.com/uploads/1/3/0/7/130740166/fipolel-salupis-rivimazo-lexiretes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379964/normal_600719b17c81d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460066/normal_5fc9dfa78c8cf.pdfIn PDF document text
    • https://jizufuvarax.weebly.com/uploads/1/3/1/1/131164460/c43f4592.pdfIn PDF document text
    • https://dobojadu.weebly.com/uploads/1/3/2/7/132711966/80a2cce00ec41b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425759/normal_5ffb68da6a6cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480162/normal_5fdf025ac1ef8.pdfIn PDF document text
    • https://moxetutatag.weebly.com/uploads/1/3/4/2/134234950/bugogugasenuworo.pdfIn PDF document text
    • https://fejegexe.weebly.com/uploads/1/3/4/6/134617501/6347921.pdfIn PDF document text
    • https://karopudalel.weebly.com/uploads/1/3/4/8/134881347/49eeb83ea990b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498971/normal_60446af48f90e.pdfIn PDF document text
    • https://rufibomorogad.weebly.com/uploads/1/3/4/5/134505720/karuw_kuxuzut_risaxovuwem.pdfIn PDF document text
    • https://livozowenenebu.weebly.com/uploads/1/3/0/8/130874097/cce5ab299.pdfIn PDF document text
    • https://gusujosu.weebly.com/uploads/1/3/0/7/130775940/1998324.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_off0000fb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB49 4884 bytes
SHA-256: 7305d1230ef9758b6c4ca929d739c5ee4a00d8e782adc9d92930b950d2bff8c1
font_01_sfnt_off00010be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE9 11032 bytes
SHA-256: 7fc9e6fdcf629db8f984d2a0263b7e66ef9a22478996fb7721ad5aa0c4cf48dc