Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1a56d2b50c8a5c…

MALICIOUS

PDF

82.4 KB Created: 2021-03-12 15:37:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 174beca158fbf702c01abc893a44506b SHA-1: 2b0f25977b5ef7c17133706b5635ffd42932205a SHA-256: 4a1a56d2b50c8a5c2385fc723231f0aeb27fd40626b955677f940fde31e65910
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/strik?utm_term=why+won%2527t+my+wahl+clippers+turn+on PDF link annotation
    • https://cdn.sqhk.co/zoxowowi/aiiidge/96316583829.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanekoxo/gghHjaV/17585685723.pdfIn PDF document text
    • https://bitiwinelezom.weebly.com/uploads/1/3/1/8/131856531/vetemuzu-loxagut.pdfIn PDF document text
    • https://zonujonuwug.weebly.com/uploads/1/3/4/3/134309714/sawiropugetiwibus.pdfIn PDF document text
    • http://viwoxufegoger.sportsontheweb.net/30290017448.pdfIn PDF document text
    • http://kenugizi.getenjoyment.net/kejulun.pdfIn PDF document text
    • https://fikuvigobe.weebly.com/uploads/1/3/4/5/134582673/juwivajividoxepolid.pdfIn PDF document text
    • https://cdn.sqhk.co/mibuguxinise/j4XPJTS/swing_chair_with_stand_indoor.pdfIn PDF document text
    • https://lanapovo.weebly.com/uploads/1/3/1/4/131437145/b21c1df8.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/jezobasit/apostrophe_quiz.pdfIn PDF document text
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_adde22e31ca54fcca3d659e8fec7884d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/palevijuj/a_tamil_movie_hd.pdfIn PDF document text
    • https://3b044092-e341-4c69-a8e2-52b14fc1865f.filesusr.com/ugd/370021_c6bcf169da2f4d8780340ad0bfa4ae5f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/rejolefoxiw.pdfIn PDF document text
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_192f336a773943dba331aa0a07f7ead3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/libeganot/51815402620.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/badlapur_full_movie_mp4.pdfIn PDF document text
    • https://0926596c-b1e6-4473-87d6-fed2e709bfeb.filesusr.com/ugd/e2a635_2af657fd326a4ea5915afd6636f28894.pdf?index=trueIn 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_off0001051c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051C 5412 bytes
SHA-256: 6f5996376c4d80b4284c9d3fd783ad410f241b412576f3df0de6c1a2c326a2a8
font_01_sfnt_off00011779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11779 10752 bytes
SHA-256: fd534a98a62c85a65ce832adf7019e91508713f7501cdf6503d143ee549b6476

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