Malicious PDF — malware analysis report

Static analysis result for SHA-256 13ed41bd1d5812b3…

MALICIOUS

PDF

79.5 KB Created: 2021-05-23 19:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f33ac524556e6de6282f0ec86a1f60ab SHA-1: 5dc275cc2e195e97fbdf6b454d846876a328fbb6 SHA-256: 13ed41bd1d5812b3ecf097c899dd7306ca4750041e0b6df5936ab6f06dc54f9a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or phishing operation. The primary URL, https://pelibifir.ru/strik?utm_term=daily+yoga+routine+for+beginners+pdf, is presented as a yoga guide but likely leads to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://pelibifir.ru/strik?utm_term=daily+yoga+routine+for+beginners+pdf PDF link annotation
    • https://duloduwo.weebly.com/uploads/1/3/4/8/134850843/vomowuxatafugijodivi.pdfIn PDF document text
    • https://xixasoxi.weebly.com/uploads/1/3/5/3/135324484/9201263.pdfIn PDF document text
    • https://negofajosodin.weebly.com/uploads/1/3/5/3/135314147/sefogurimuj.pdfIn PDF document text
    • https://baxemazone.weebly.com/uploads/1/3/0/7/130739829/8300744.pdfIn PDF document text
    • https://kuburabet.weebly.com/uploads/1/3/4/3/134362545/jorelafuton-zagobunejo.pdfIn PDF document text
    • https://nelibijejukeli.weebly.com/uploads/1/3/1/4/131437261/bavivudo-duzuzag.pdfIn PDF document text
    • https://latewumopinigan.weebly.com/uploads/1/3/4/3/134313498/gipiganijajog.pdfIn PDF document text
    • https://xowunaxevome.weebly.com/uploads/1/3/4/6/134679103/9282645.pdfIn PDF document text
    • https://resuzomesidi.weebly.com/uploads/1/3/4/7/134746605/topinopiwu.pdfIn PDF document text
    • https://nujetamewude.weebly.com/uploads/1/3/4/8/134881912/5041943.pdfIn PDF document text
    • https://begakidiwadagav.weebly.com/uploads/1/3/1/3/131397934/c212dd.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/sulasatevirexo/super_smash_melee_fox_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31a51016-0c2c-4213-9200-ea8b7682e02d/vevekamep.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/fema_flood_maps_google_earth_pro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1efebc4-b929-40b5-a119-42859a2b409f/jazufexinirovifisugu.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/70731571134.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/gesuwakikorifizotodi.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/60789365170.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb47494f-69ce-4097-91b6-6f9f6ca8369e/www_usps_gov_email_login.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/xuderufure.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_off0000f7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D7 5452 bytes
SHA-256: d96e64e5dc8c6b950134ec2a150ebd06830623173c31622fd4bccbab71edd9b1
font_01_sfnt_off00010a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A79 10712 bytes
SHA-256: 8630e5bf7173c8921f53f566846f2a8bd1ad46d8685cfe2a7de7c3169960063c

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