Malicious PDF — malware analysis report

Static analysis result for SHA-256 53db8cfec5a25def…

MALICIOUS

PDF

79.3 KB Created: 2021-03-28 19:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 5b29105fff9cc38bb24350be2080bc62 SHA-1: f3f34e8ea86cf7ce8070126cc219b17a2099428e SHA-256: 53db8cfec5a25defd8fc7487ef340c5cbdf7b32850cf3e51b2f9b42ddeb9b446
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=what%2527s+the+difference+between+asics+gt+1000+and+gt+2000 PDF link annotation
    • https://deremorukoj.weebly.com/uploads/1/3/4/4/134490203/rileru.pdfIn PDF document text
    • https://jaweditulopo.weebly.com/uploads/1/3/4/3/134313576/c5256335727e7.pdfIn PDF document text
    • https://bezofaxifi.weebly.com/uploads/1/3/1/6/131606652/21081fb9c8.pdfIn PDF document text
    • https://cdn.sqhk.co/karapenakozi/4ibhdJH/marketing_manager_jobs_houston.pdfIn PDF document text
    • https://nituxokijawagez.weebly.com/uploads/1/3/0/9/130969825/desopalizobedoganenu.pdfIn PDF document text
    • https://bilemupu.weebly.com/uploads/1/3/4/6/134654663/borowobujiwozimidak.pdfIn PDF document text
    • https://cdn.sqhk.co/zokosofu/jghiibH/wuboladaxogebubavul.pdfIn PDF document text
    • https://xizuxikeg.weebly.com/uploads/1/3/0/7/130740292/vejoged-zefisuxepisa-duvul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gezetega/aliner_classic_manual.pdfIn PDF document text
    • http://rabuxudizuxu.epizy.com/23734688932.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/free_division_worksheets_for_year_2.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/lalomumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9a4337b-f0ff-463e-9084-487175af4102/traktor_s4_software_download_crack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1a395b9-270f-42e3-83e8-b4325ec32bf6/how_to_change_honeywell_humidifier_pad.pdfIn PDF document text
    • http://reditab.epizy.com/comprendre_alcools_de_guillaume_apollinaire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bc770ef-b45a-4456-a1ca-3922c63116f0/adobe_premiere_pro_cc_2020_free_download_for_lifetime.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA42 5532 bytes
SHA-256: 905ea8923b8d21b3ecd197ae176826760de19a916b3b0f072015d7d960fcc5c9
font_01_sfnt_off0000fd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD26 10664 bytes
SHA-256: 0b05f9f6bfd531a9d78981db61526e93a0271fff32bbe7f669811898cc796c0a
font_02_sfnt_off000121af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AF 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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