Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbc884d712abfc02…

MALICIOUS

PDF

84.7 KB Created: 2021-03-19 13:12:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42e36f59595ad4953758597d72b9872f SHA-1: 17ecea895a5409f14cd7f71a722cc1a03c700119 SHA-256: bbc884d712abfc02eab31e10c00f1bea144148d947854e7b88c63199d2c85818
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 SEO-optimized and point to potentially malicious or phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for distributing further malware or conducting phishing attacks. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious content.

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://dafemum.ru/award?keyword=oil+gas+company+analysis+upstream+midstream+and+downstream+pdf
    • https://judenebubiz.weebly.com/uploads/1/3/4/6/134656374/01f0c.pdf
    • https://tulelamesesixe.weebly.com/uploads/1/3/5/3/135321102/fa6ebde8528b3.pdf
    • https://zubikazosiz.weebly.com/uploads/1/3/4/7/134761183/9018152.pdf
    • http://remont-kvartir-otzyvy.moscow/college_chemistry_lab_report_formatvvry2.pdf
    • https://rinotawobuv.weebly.com/uploads/1/3/4/7/134768279/xexosowiriku.pdf
    • http://javefuxola.getenjoyment.net/xutuvojofa.pdf
    • http://natnat.fun/lemuvopojera7apsv.pdf
    • https://bunojero.weebly.com/uploads/1/3/0/8/130874162/1566486.pdf
    • http://guzexesuge.mypressonline.com/how_to_reduce_acne_marks_naturally_at_home.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://tosabukevosubar.myartsonline.com/harbor_breeze_ceiling_fan_manual.pdf
    • https://uploads.strikinglycdn.com/files/4f095790-092e-421e-9a03-571457f99d33/what_was_the_first_form_of_government_in_ancient_greece.pdf
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_f4cb996bb49c48deaaaad49fd1e0808e.pdf?index=true
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_6b9261407ab54ec196eb16498d8ea5e1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e00e62ae-f810-452b-9877-c960ea1b9b7c/the_secret_language_of_birthdays_relationship.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_off0000fed0.bin
249f2581b9ca9b2fa87b61f7124333870570d1fdb75b088334def3ca8ae49896		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFED0 5576 bytes
font_01_sfnt_off000111bc.bin
f78e5881138125a0793fa12389aa540a18d27207f9c33b4b071d91514861401a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111BC 11352 bytes
font_02_sfnt_off00013735.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13735 4324 bytes

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