Malicious PDF — malware analysis report

Static analysis result for SHA-256 948a1496853b8aba…

MALICIOUS

PDF

66.3 KB Created: 2020-12-24 21:06:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 6da8685ce79d14bd82ee281c8371b138 SHA-1: d23382b43fe70fb5f74d6c19418a1c59414ebde6 SHA-256: 948a1496853b8abaa28a5034e30ecbf46d7c68301239cb7b62eb23ba8581b53e
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a large number of external links, many hosted on disposable domains, indicating a link farm likely used for SEO spam or to distribute further malicious content. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to potentially harmful websites.

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://trafficel.ru/123?utm_term=david+sherrill+movies PDF link annotation
    • https://bajusumuke.weebly.com/uploads/1/3/2/7/132741128/ripifotenero_kilipir_tawugimagip.pdfIn PDF document text
    • https://misutinulil.weebly.com/uploads/1/3/1/4/131407711/90efe50069.pdfIn PDF document text
    • https://kagizorofom.weebly.com/uploads/1/3/4/4/134476017/wazime_lomiziziginoban_fevadavuzip_wowijek.pdfIn PDF document text
    • https://xigujevaw.weebly.com/uploads/1/3/4/7/134701692/1682ed04f.pdfIn PDF document text
    • https://beserozufem.weebly.com/uploads/1/3/4/8/134864657/xisomililopu.pdfIn PDF document text
    • https://cdn.sqhk.co/linerutinew/ohg0fie/35531934445.pdfIn PDF document text
    • https://boxesagako.weebly.com/uploads/1/3/4/5/134589877/f9605ed4.pdfIn PDF document text
    • https://sojabejob.weebly.com/uploads/1/3/4/8/134890412/kuvavepubu.pdfIn PDF document text
    • https://vuvajufuzuno.weebly.com/uploads/1/3/4/4/134480129/vipadijaso.pdfIn PDF document text
    • https://wobomiti.weebly.com/uploads/1/3/4/5/134501920/tosoxoxenefo.pdfIn PDF document text
    • https://sidugavumudoriz.weebly.com/uploads/1/3/4/9/134902227/suwuvarad.pdfIn PDF document text
    • https://zavamemedu.weebly.com/uploads/1/3/4/3/134305249/9446434.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ratixifo/75238314537.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/4184598462.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC552 5124 bytes
SHA-256: e137c1f3d0cc1eaacd6c41b7c09b700a7febaad7ea93889ab7e676fab134474a
font_01_sfnt_off0000d69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69D 10964 bytes
SHA-256: 96e5c2331f434c50854a9e03a9a278f3efb55961eb012d8c62b0922000fa06a2

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