Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b4ef77adbb671d…

MALICIOUS

PDF

95.9 KB Created: 2021-05-22 00:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 37b201ab607430a5fa3dc921bffba553 SHA-1: bcdb72a886b42abbbf4bb76542702e3b4b04e2d7 SHA-256: 83b4ef77adbb671dbf1b30741e60130ff65d72d1e6f6a50d64a1503fec0b3b29
156 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 of which point to other PDF files, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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=how+to+calculate+kva+from+kwh PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4475208/normal_6002521422a42.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393632/normal_5fe49f2d6a34c.pdfIn PDF document text
    • https://pikoxujedogusu.weebly.com/uploads/1/3/4/6/134665618/pelojufusuxojime.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443602/normal_5fe400d36efdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446263/normal_603bd99d25498.pdfIn PDF document text
    • https://dokakuzod.weebly.com/uploads/1/3/4/8/134884054/9288270.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406481/normal_60053c544894f.pdfIn PDF document text
    • https://xazulifego.weebly.com/uploads/1/3/4/7/134727283/1067879.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476146/normal_5ff29bfe000c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485935/normal_5fcd389c6cfcd.pdfIn PDF document text
    • https://duvozeja.weebly.com/uploads/1/3/0/7/130739152/mevuxilukexuze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483070/normal_5fca882a79020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425009/normal_5fc7c1eb690aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367299/normal_60340e0aedd5c.pdfIn PDF document text
    • https://rulotukipaka.weebly.com/uploads/1/3/0/7/130776525/zipelasi.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/ab75c572-ab13-4748-8af6-f161fa2fcf7a/java_8_streams_tutorial_oracle.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/buffer_solution_project.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/4832488172.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/durrells_of_corfu_episode_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/idsa_febrile_neutropenia_guidelines_2014.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/barracoon_zora_neale_hurston.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b44b15a-a359-4f42-b869-c2c0c0b66db4/zoo_york_watch_white.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_off00012d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7C 4848 bytes
SHA-256: 0dd58a95d70873d5685d650780d054a0d27391dbeb77b209ae0635b514abdec1
font_01_sfnt_off00013e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E0B 11132 bytes
SHA-256: a0e46dc06fc145568cd4f68fea19b3aa43603afc3e5b145dc4c71a55a292f9bf
font_02_sfnt_off00016430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16430 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

Open this report in the interactive analyzer, or submit your own file for analysis.