Malicious PDF — malware analysis report

Static analysis result for SHA-256 019758aec4cfe1b2…

MALICIOUS

PDF

76.6 KB Created: 2021-03-11 04:13:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7fdb4b397ac1ff3dd968be00dfa4377a SHA-1: 8907280c41f67613c35e304d6b5c30bea1ee4873 SHA-256: 019758aec4cfe1b25cd2a434aadaa59a53d8cd0ade2de0ad80210a92b3deb821
186 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 0.9990

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://jottigo.ru/123?utm_term=best+messaging+app+for+android+and+iphone PDF link annotation
    • https://tulovituvo.weebly.com/uploads/1/3/4/2/134234708/854f01c25573.pdfIn PDF document text
    • https://cdn.sqhk.co/jotapepikota/jcBBjd2/world_history_and_geography_ancient_civilizations.pdfIn PDF document text
    • https://vorusasu.weebly.com/uploads/1/3/2/7/132740845/a96d59b6e.pdfIn PDF document text
    • https://mowazaxof.weebly.com/uploads/1/3/4/7/134704653/bokatonarozav.pdfIn PDF document text
    • https://cdn.sqhk.co/sileluzorupo/ijgjm7L/30715008138.pdfIn PDF document text
    • https://tiguxenejizowi.weebly.com/uploads/1/3/4/8/134899735/8047134.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/ihKjjcR/bezujekudukofena.pdfIn PDF document text
    • https://wukodotimage.weebly.com/uploads/1/3/4/4/134487216/renoguzisuk_medig_zedafipuj.pdfIn PDF document text
    • https://rarejiwu.weebly.com/uploads/1/3/1/6/131606055/xuwoganujuxudi.pdfIn PDF document text
    • https://cdn.sqhk.co/vizejagojib/jCjctBV/jizadoxuj.pdfIn PDF document text
    • https://rexawalifutox.weebly.com/uploads/1/3/4/4/134458468/2298395.pdfIn PDF document text
    • https://zotepuzexalebox.weebly.com/uploads/1/3/5/3/135397030/vakenexagoj.pdfIn PDF document text
    • https://wajonurogizi.weebly.com/uploads/1/3/0/7/130738566/92b72a7.pdfIn PDF document text
    • https://cdn.sqhk.co/kijowevo/Pge8Iwu/zenawixusewukigikewof.pdfIn PDF document text
    • https://galinigogazefu.weebly.com/uploads/1/3/2/6/132695851/tidawadefidovavamak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xawavejemefo.epizy.com/gekabolomol.pdfIn PDF document text
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_068b08c392ed48e2abbb6f8d5b9d68fa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wemupajese/water_pollution_images_for_project.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/importance_of_interpretative_reporting_in_journalism.pdfIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_996ab9f9eaf6493f9ccaf8be9c118b31.pdf?index=trueIn PDF document text
    • http://wofofuzumoju.rf.gd/xapixikoxaz.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/haydn_trumpet_concerto_3rd_movement_sheet_music.pdfIn PDF document text
    • https://48e4e0df-78ce-4736-8797-27735e68dc67.filesusr.com/ugd/f3b179_8334bda3564145b3839f0c4bb756545c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nowokil/aagadu_3gp_video_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/57259672550.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_off0000eed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED2 5472 bytes
SHA-256: e0382836713ec0a1a2434339613c6c5b847ee5f409c1ec795564954c77557dd5
font_01_sfnt_off00010146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10146 10224 bytes
SHA-256: bebcdbb07f4db1df36d33627b979e095d36a69402b38300f2d1b1540e5f03022