Malicious PDF — malware analysis report

Static analysis result for SHA-256 539fb340a76008d1…

MALICIOUS

PDF

90.2 KB Created: 2021-02-09 00:50:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86a74e327e240013b683cb64aff96fc8 SHA-1: 379ba77b0309c10ed5fee073b46d3c937ff8b46f SHA-256: 539fb340a76008d1550df157d15b3239fa203a1e1ed5b8c7f4f0a03950ac9e7d
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, with the primary heuristic indicating a link farm designed to direct users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=colleges+that+require+sat%252Fact+essay
    • https://vabeliguteziji.weebly.com/uploads/1/3/1/3/131379360/nalikukokugu-vomomezobizalo-gelubizesata-rizotazedurata.pdf
    • https://static.s123-cdn-static.com/uploads/4454161/normal_5fdf85e0a4b53.pdf
    • https://cdn-cms.f-static.net/uploads/4407749/normal_5fe995b34a31e.pdf
    • https://cdn.sqhk.co/wanevakaxuma/Ghehbjd/formula_acceleration_1_car.pdf
    • https://gozezitigaja.weebly.com/uploads/1/3/4/3/134340412/rovavozivokarowowa.pdf
    • https://cdn.sqhk.co/riragimi/bgImgcb/bloons_td_6_free_mod_apk.pdf
    • https://funoridarudaru.weebly.com/uploads/1/3/5/3/135304061/nevibulefowol.pdf
    • https://wilowukodol.weebly.com/uploads/1/3/4/8/134881933/bd3e43ae92f1701.pdf
    • https://vufobuvi.weebly.com/uploads/1/3/1/1/131163959/4202646.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/wiremeresegikon/house_rental_application_form_template.pdf
    • https://s3.amazonaws.com/tigovatolis/self_certification_sick_note_form_uk.pdf
    • https://s3.amazonaws.com/pajukovuxetu/tozasivazakokokexopokusuj.pdf
    • http://fafuwite.epizy.com/instagram_blocked_list_android.pdf
    • https://s3.amazonaws.com/tuletivotarupu/dance_basanti_song_bestwap.pdf
    • https://s3.amazonaws.com/rabewiruzitewa/91686500312.pdf
    • http://godorapibiveze.epizy.com/austerlitz_2016_movie.pdf
    • https://s3.amazonaws.com/muxozuvalubi/hbr_data_analytics_basics_for_managers.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112ca.bin
07c11fc4e3af51ea16e3e120256cd542ec6723074d12a82ed508c8b9c84f6773		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112CA 5124 bytes
font_01_sfnt_off00012467.bin
70fbcaa19617537cbf5fd4d979608077fce08352e26d97f86d499e0dda6aa3bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12467 12908 bytes
font_02_sfnt_off00014d2d.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D2D 4324 bytes

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