Malicious PDF — malware analysis report

Static analysis result for SHA-256 b53fb7697411da6f…

MALICIOUS

PDF

78.2 KB Created: 2021-04-02 13:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6048e12bec502083e50e4f478ac1ced5 SHA-1: 19c715bf6f0f8a5f09bfe55cd475bef9807780eb SHA-256: b53fb7697411da6f30251904cef55fc2a86152855653178ddfc3eb780aaed4d8
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, indicative of a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/award?keyword=background+check+consent+form+pdf PDF link annotation
    • http://zutatowatipo.mywebcommunity.org/teorema_binomial_newton.pdfIn PDF document text
    • https://negowuvezesat.weebly.com/uploads/1/3/4/8/134859399/1977831.pdfIn PDF document text
    • https://kasadinup.weebly.com/uploads/1/3/4/6/134641165/6770666.pdfIn PDF document text
    • https://bifomika.weebly.com/uploads/1/3/1/8/131856700/01972c976915b.pdfIn PDF document text
    • https://nobametu.weebly.com/uploads/1/3/2/7/132740930/kugudolojigaw_zoxut.pdfIn PDF document text
    • https://serijarivak.weebly.com/uploads/1/3/0/7/130776739/xosukasizumasa.pdfIn PDF document text
    • https://dasubafetimediz.weebly.com/uploads/1/3/4/6/134673415/tixiwok.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/woxewiwupir/mejufakerewapidetitoro.pdfIn PDF document text
    • https://041aa876-b65b-432c-96c0-58c8b295a4e4.filesusr.com/ugd/90d19e_a78793cdd83f4990ae12eb146374b153.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/79626731124.pdfIn PDF document text
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_5bfcbd16cb5a4c718d41f97735b901ca.pdf?index=trueIn PDF document text
    • https://fa886832-b9e3-4ce5-a98c-97da2614721f.filesusr.com/ugd/9f8050_76873a774b66463896639364f7b07d2d.pdf?index=trueIn PDF document text
    • https://926fca10-1439-4adc-b819-38dad5327275.filesusr.com/ugd/26d6d3_3ec4fe2337f24d85af5d2d6f438fe368.pdf?index=trueIn PDF document text
    • http://zejusamipokera.myartsonline.com/how_to_program_universal_remote_to_seiki_tv.pdfIn PDF document text
    • https://e2a3f85e-3ce8-4c76-99a2-e63219cad5ad.filesusr.com/ugd/473d25_d1e6f232537a45fd958c70aa08470cf0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/medical_terminology_words_list.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/19754479036.pdfIn PDF document text
    • https://983c8978-ad56-435f-a988-47358aa6040c.filesusr.com/ugd/06a663_545c01c1fb4d4ebe984e9aa92c06f1df.pdf?index=trueIn PDF document text
    • https://8488b7ac-84bc-45ae-88ed-26841205fc59.filesusr.com/ugd/7cda3c_6e597f0c98f64760b2e7d9eaf587a3e8.pdf?index=trueIn PDF document text
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_ff00c176e16c4a6e8ce39a77fc53db3e.pdf?index=trueIn PDF document text
    • https://f1c0478e-57b3-422a-b8eb-433964b677d2.filesusr.com/ugd/16c17d_9756b38e032b4d08ad6d19bb397245bc.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_off0000f2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C0 5648 bytes
SHA-256: 8fa761967c8e5523c5806b5a03c45a148ca4bb380643766bb39dd52c05c2262e
font_01_sfnt_off000105d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D2 10540 bytes
SHA-256: 69a6a63a2bef20dfc8112379dcbd2fd1a03783b424d6e2e00b357d06dc87ae0f