Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4123d4337b4c97d…

MALICIOUS

PDF

77.4 KB Created: 2021-05-27 04:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 63ac9bf086459028fd7952c1fb1742b8 SHA-1: 61db019053d01430b1e0cbcc4a05ba8509f3c0b6 SHA-256: c4123d4337b4c97d5255c01e17953f808d25907232940ffac184639e522ab786
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 or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/strik?utm_term=how+to+make+a+platformer+scratch PDF link annotation
    • https://mesakejaj.weebly.com/uploads/1/3/4/7/134754162/1279911.pdfIn PDF document text
    • https://tafiweva.weebly.com/uploads/1/3/5/9/135993394/jidipemele.pdfIn PDF document text
    • https://sopudediliwaweg.weebly.com/uploads/1/3/4/5/134587721/989100.pdfIn PDF document text
    • https://tizonitiwu.weebly.com/uploads/1/3/4/7/134734793/806398.pdfIn PDF document text
    • https://xexajuxeleseg.weebly.com/uploads/1/3/4/5/134592224/1740754.pdfIn PDF document text
    • https://bewirawafatuli.weebly.com/uploads/1/3/4/5/134595338/8666621.pdfIn PDF document text
    • https://porovepo.weebly.com/uploads/1/3/4/5/134527374/4c7fbf6.pdfIn PDF document text
    • https://vuganolo.weebly.com/uploads/1/3/5/3/135314000/90ae66c3.pdfIn PDF document text
    • https://womogidukiwu.weebly.com/uploads/1/3/4/8/134873304/fefuwuzotavejew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389352/normal_6063dc071aa58.pdfIn PDF document text
    • https://falopizesolirod.weebly.com/uploads/1/3/1/3/131379111/5484468.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418191/normal_602502091454e.pdfIn PDF document text
    • https://geroguvipem.weebly.com/uploads/1/3/4/4/134465684/9791774.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://uploads.strikinglycdn.com/files/532579fe-a5e1-43f2-92ef-bbce612e56a5/jumivomevu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c069dc7-91f1-4171-a3ab-dbf0eeb86fdd/bbc_learning_english_speaking_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5f7c9be-832a-4dd2-afc1-54a5365f54d3/40254780837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71ea5366-3aed-4de2-92c3-c34ef5b7abb0/32961912780.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abfc0cf4-5933-4fff-91e3-6b9a00ee7aba/nozajarak.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_off0000e2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EF 5004 bytes
SHA-256: 6e1c54d419373e3d29b35ca779019ba7180dad21e65107f4f574aa246fe2c07c
font_01_sfnt_off0000f403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF403 10784 bytes
SHA-256: 27384f02f515262a753cd2f26f63d1decd62d6d903edd7e632a74c32a9851f7c
font_02_sfnt_off000118dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DC 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f