Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f505ba1fcd56a53…

MALICIOUS

PDF

79.4 KB Created: 2021-04-06 08:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecfe9b979a412fadf1e1cf77c0133e43 SHA-1: acc349850aaac0542c52559500e0689e65680c42 SHA-256: 9f505ba1fcd56a53567a50a9ca70f256cc8e88e5833d34b820d12a0a492ca471
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO abuse tactic. One of the embedded URLs, https://vilenefex.ru/aws?utm_term=omron+intellisense+bp652n, is a primary indicator of malicious intent. Although no scripts were explicitly extracted, the PDF structure and the presence of external links are indicative of a phishing or malicious redirection attempt, potentially leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/aws?utm_term=omron+intellisense+bp652n
    • http://rupiwot.getenjoyment.net/alter_ego_1_hachette_free_download.pdf
    • https://xunimolozabipos.weebly.com/uploads/1/3/2/6/132681728/tefesase.pdf
    • https://rebigakudaj.weebly.com/uploads/1/3/1/3/131383708/xibusozubigib.pdf
    • https://rukazoxet.weebly.com/uploads/1/3/4/0/134040508/5518937.pdf
    • http://mukinokelek.mygamesonline.org/17481367332.pdf
    • https://tofibuji.weebly.com/uploads/1/3/5/3/135309424/sefusixepoviw_fusevizeladubaj_tojegurem.pdf
    • https://noxajigaja.weebly.com/uploads/1/3/4/6/134698193/zegubetugaw-nawevax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/10ce4233-8db2-4678-8802-ecb557a9b385/bodinawev.pdf
    • http://zegiwewezenaro.myartsonline.com/lerobifulenigomuxesaf.pdf
    • https://uploads.strikinglycdn.com/files/3e023701-1d56-47a0-a074-385eef544d79/lomamukebafuritat.pdf
    • http://fiforeru.atwebpages.com/84876098117.pdf
    • https://uploads.strikinglycdn.com/files/07805f81-16c5-4a99-9f1e-1d2e8d208088/9931848121.pdf
    • http://dufojamimusim.atwebpages.com/riesgos_psicosociales_en_adolescentes.pdf
    • https://uploads.strikinglycdn.com/files/9d2ef7bb-9d9c-43b2-b1ce-7d02015382c1/model_3_long_range_track_mode.pdf
    • http://juborekif.atwebpages.com/cardiovascular_disease_symptoms_and_treatment.pdf
    • https://uploads.strikinglycdn.com/files/42556b84-ed6a-418b-958f-b87a89436f18/zugubid.pdf
    • https://uploads.strikinglycdn.com/files/cdb3cf75-540a-4784-b665-bebf1b4c27bb/69427787657.pdf
    • https://uploads.strikinglycdn.com/files/2c0506ee-d682-4867-b5c5-f6579d9a2373/bitipifugideb.pdf
    • https://uploads.strikinglycdn.com/files/95669eac-4f7a-4530-8421-0513a172956a/wd_live_streaming_media_player_firmware_upgrade.pdf
    • https://uploads.strikinglycdn.com/files/4371230c-9579-4145-8399-7fc062c173a1/dupatorete.pdf
    • https://uploads.strikinglycdn.com/files/39f92b03-9654-4006-bc5b-5553979066a4/short_horror_stories_for_high_school.pdf
    • https://uploads.strikinglycdn.com/files/87d8f2b2-686a-4aab-a9db-6e8614c70cc3/maha_ganapati_stotram_telugu_lo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eba3.bin
0ea9873026b75d526eb913e8eadff2e36f3484380d1a47afefea7a2279d1ce13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA3 5332 bytes
font_01_sfnt_off0000fda8.bin
61d27f75559b28f048e5fa75fd87908b081747258541e556fd769c8ab539932c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA8 15608 bytes

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