Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f9581ecf2d18b07…

MALICIOUS

PDF

78.4 KB Created: 2021-05-28 05:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 82312e9c0c5154c421dcd44288989d21 SHA-1: 67a4805595ef35dd927d40902ffe118517c4a57b SHA-256: 0f9581ecf2d18b07dc992ff1bcf5d20edca909e7d02be4b38d5bc5b15ce07e5e
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, with ClamAV specifically flagging it as 'Pdf.Phishing.Trojan'. The embedded URLs suggest a phishing or malicious content distribution attempt, likely leveraging SEO tactics to attract victims. No scripts were extracted, but the overall structure points to a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/123?utm_term=does+the+black+moon+howl+answer PDF link annotation
    • https://refapolujagosax.weebly.com/uploads/1/3/4/8/134896756/dutuzimixuf_kurapitiw_xokigosotidepa.pdfIn PDF document text
    • https://joxeluduxena.weebly.com/uploads/1/3/4/7/134772203/bc5d79a9fc.pdfIn PDF document text
    • https://favaruzikab.weebly.com/uploads/1/3/4/8/134871436/tonevaxex-dufifovaja.pdfIn PDF document text
    • https://lesapexif.weebly.com/uploads/1/3/1/6/131637780/mejewolexawares-meveranonedupa-wanuvagenurim-zuvobetezem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422628/normal_603a281191b8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421611/normal_5fd17622a9e30.pdfIn PDF document text
    • https://xuxulavadimuxa.weebly.com/uploads/1/3/4/2/134234789/pefure_dafaj_rugomajipubis_towiwasegitoxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489843/normal_60567fa90c3b9.pdfIn PDF document text
    • https://pexafibilo.weebly.com/uploads/1/3/4/4/134484824/7361748.pdfIn PDF document text
    • https://noremovex.weebly.com/uploads/1/3/4/8/134883944/5511927.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454043/normal_601d9d3858c9e.pdfIn PDF document text
    • https://voluwunuzusiju.weebly.com/uploads/1/3/1/4/131452861/lilabuj-tukolabobip.pdfIn PDF document text
    • https://namazowofurap.weebly.com/uploads/1/3/4/3/134372349/dutovoxul_nasogigewodaf_xovuzugilegovuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456686/normal_6033b267620b6.pdfIn PDF document text
    • https://minileponefij.weebly.com/uploads/1/3/1/0/131070526/fegeselujufuxo-vovexeza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380230/normal_6006a8bc4b45f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5851612-9a58-4e86-b725-d8b2b30d5531/whirlpool_dishwasher_wdt970sahz_parts_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b167813-8816-4725-b3b0-a77d2b0b04da/how_to_turn_off_wifi_on_summer_baby_monitor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/590ff99c-41d9-41b7-8015-35ba2e948c9f/the_social_construction_of_reality_berger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed30ad66-3c78-4979-adee-66421e22b443/weight_watchers_food_scale_troubleshooting.pdfIn 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_off0000f31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31E 5336 bytes
SHA-256: d68e35daabef033f0f89ad8e8e564741c3111c0364a84696e4b12bd440003888
font_01_sfnt_off0001052b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052B 11372 bytes
SHA-256: d0b4965915c6c9f9db9867900ec08262d630e8eb6ef80007f0f1a1b198e1f86d