Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8c6ec1d69af52e…

MALICIOUS

PDF

77.8 KB Created: 2021-03-05 11:49:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: eb3b0145d2c1b66e1a613a45f7bac2cc SHA-1: 8389e79c8f08ec45bf990083e5733b323bc43d61 SHA-256: ec8c6ec1d69af52ec3a7f2c5cc3ac74a52380ce7e60aa590b7fe86c6e2805c53
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/123?utm_term=colt+1860+army+serial+numbers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366401/normal_5fe23ea4b4d0c.pdfIn PDF document text
    • https://mumetimobenuja.weebly.com/uploads/1/3/2/3/132302956/vipukoxova.pdfIn PDF document text
    • https://matasomorat.weebly.com/uploads/1/3/4/4/134492922/ee7cb3144a4b04.pdfIn PDF document text
    • http://trychambre.xyz/dewalt_733_replacement_partsyr024.pdfIn PDF document text
    • http://alphabitx.com/zigoloxuxcg89h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452398/normal_6041cf16a24c6.pdfIn PDF document text
    • http://fredo.run/armada_band_hargai_akunv7re.pdfIn PDF document text
    • http://indonesia2health.online/29955639114tvqim.pdfIn PDF document text
    • http://rankingcoach-apps.com/is_leap_year_on_netflix_australiaz6z8o.pdfIn PDF document text
    • http://uose.xyz/87961511849q65dl.pdfIn PDF document text
    • https://numilobes.weebly.com/uploads/1/3/4/2/134235742/fosogo.pdfIn PDF document text
    • https://roguzemu.weebly.com/uploads/1/3/6/0/136018034/aad32f1.pdfIn PDF document text
    • https://dimawirosaj.weebly.com/uploads/1/3/3/9/133997296/7853681.pdfIn PDF document text
    • http://hd-cam-mirror-up1.club/71914575164u3760.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/huawei_sun2000-_20ktl_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/5e_pugilist_tasha.pdfIn PDF document text
    • https://73b3f487-90f5-41a6-bf44-750372f72efd.filesusr.com/ugd/39e8d0_cef122e914554199b277ad0cda570a16.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pisik/pisizo.pdfIn PDF document text
    • https://fab88ded-2f12-46c9-b6ec-f290036286cc.filesusr.com/ugd/cce69c_dc04a7ee4fce46679fb3c74584d5e3d0.pdf?index=trueIn PDF document text
    • https://c4e42e93-254c-4ba8-b495-737f84002742.filesusr.com/ugd/ddb60a_23d1564a792844ff85377d5bd4616c07.pdf?index=trueIn PDF document text
    • https://bad3f395-1638-4667-b349-d6f934eeab49.filesusr.com/ugd/ed2d23_84b4c2a1f0104fe1b7d08180dcad0387.pdf?index=trueIn PDF document text
    • https://b2d1eea7-aef5-47fc-962c-88b5513ecafc.filesusr.com/ugd/3a57bc_cd099bab85b3448ab5e4010157320cb8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wavunot/urban_lads_kannada_album_songs_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BC 5520 bytes
SHA-256: 7b171d516d06b34719024e458fe10bf357e255f4a03af82611ff877e3f739fac
font_01_sfnt_off0000f768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF768 10580 bytes
SHA-256: 7a0bbdc98721bbc26c9dd7364129bccc2391c445b44d950d3527076e0a36d23b
font_02_sfnt_off00011ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA9 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f