Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef3e513f436af038…

MALICIOUS

PDF

72.9 KB Created: 2020-12-23 04:02:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: dc2c12fc1cbcc307804b802525b652c4 SHA-1: 60b83f9d7a96fc2154646d1aafe779cc7c54be0f SHA-256: ef3e513f436af0389bf9c9dfb04359ec9ab08a36062cc684d6945b6a00036e7d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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, suggesting a link farm designed to redirect users to potentially malicious content. The primary lure appears to be a free dictionary download, indicated by the URL parameter 'utm_term=offline+advanced+english+dictionary+free+download'. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent, likely related to phishing or malware distribution.

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://trafffi.ru/strik?utm_term=offline+advanced+english+dictionary+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374522/normal_5f8e15f8d1428.pdfIn PDF document text
    • https://waboralitenir.weebly.com/uploads/1/3/4/5/134504299/mijipij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474218/normal_5fe28ff173340.pdfIn PDF document text
    • https://zimiduninu.weebly.com/uploads/1/3/1/6/131637103/65e01348438.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421639/normal_5fab31bcc72b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445326/normal_5fa12f471b2de.pdfIn PDF document text
    • https://razivixa.weebly.com/uploads/1/3/4/4/134498077/2706032.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449192/normal_5fdb7f88bf9b0.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/tunitulo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/313de936-dc8a-4820-ac7e-2a25683f23f9/nanupiru.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/2456189581.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/biwapomokodemunobomalujem.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/como_se_comunican_los_delfines.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_off0000cdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD8 4224 bytes
SHA-256: 7e06c9e03a9af325f04416cc2661fa2a814201b83753594b4357796f1f84922c
font_01_sfnt_off0000dcab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAB 5564 bytes
SHA-256: be3e252c3c0cd7d8c65d7f31560d03d478719c0dfe286334ada9291234a4443e
font_02_sfnt_off0000efaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAF 11404 bytes
SHA-256: 4b36a7c7a7cf2c3c6c360431c63267bcd1f70d08994dfd0eae886036c040157f

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