Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c686cb02e8da599…

MALICIOUS

PDF

85.0 KB Created: 2021-04-07 22:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f3bd3f20846d43da092bf0591f7707a SHA-1: 28fa87db4bfcccbf382228e9b60d7163204df235 SHA-256: 5c686cb02e8da5994c66b1c9df36e68330c4a58a2f7d9531c155dcafec7297f4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://soxebez.ru/123?utm_term=kabir+singh+bekhayali+song++ringtone
    • https://cdn.sqhk.co/jurugaguvedu/ifygghi/51213346046.pdf
    • https://dobisuji.weebly.com/uploads/1/3/1/4/131454523/ac11370.pdf
    • https://fujireroxilurig.weebly.com/uploads/1/3/4/6/134649353/956996.pdf
    • https://difodofixipa.weebly.com/uploads/1/3/0/8/130814112/3117263.pdf
    • https://cdn.sqhk.co/kewukapugino/bSQEYSc/60048479505.pdf
    • https://konilusikiwi.weebly.com/uploads/1/3/3/9/133986353/0f882d.pdf
    • https://cdn.sqhk.co/puberufibo/icjjJJu/5584330660.pdf
    • https://cdn.sqhk.co/dawolesirip/iCZSGvH/vsco_cam_filters_free.pdf
    • https://menudobuwowewil.weebly.com/uploads/1/3/4/7/134765252/lojifelivegodev.pdf
    • http://sozapemogoz.mygamesonline.org/49682252314.pdf
    • http://pijakonojimuw.iblogger.org/android_auto_app_missing.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dazovosugev/hampton_bay_ceiling_fan_remote_control_stopped_working.pdf
    • https://s3.amazonaws.com/ronatiduzoxij/19949631810.pdf
    • http://dolojivek.onlinewebshop.net/site_reliability_engineering_o_reilly.pdf
    • http://rokivurudaga.epizy.com/66563226710.pdf
    • https://s3.amazonaws.com/serogajugomiji/roriposilukesipaxibusom.pdf
    • https://s3.amazonaws.com/rezugekolaba/87580691141.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df05.bin
42e3783caedf448e14fcbc75b18e161657efc393aa677f58ca9a5bff480967cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF05 2988 bytes
font_01_sfnt_off0000e9b6.bin
69beda9266a431b7b4bc33bdd95057429310430ce50f3f7fbc7743997958fc48		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B6 5220 bytes
font_02_sfnt_off0000fb71.bin
6be695d081bfc1b63d80b320725038db4c9717490e6af3f5f1a6ce404c701054		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB71 3388 bytes
font_03_sfnt_off00010922.bin
3c3ef742372e10201438dece7114570d990b7cdc0e27883b6a8f8bb1ba90a40e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10922 10864 bytes
font_04_sfnt_off00012eb0.bin
74d93773f660cf468826769b59883d98b4b474227a153ed8e537329a62ef1ce7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB0 16740 bytes

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