Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad5dcfc616488d66…

MALICIOUS

PDF

122.5 KB Created: 2021-03-15 21:07:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c5b7d9fd53630c0887ce374b5948af81 SHA-1: d4444441931e5cf9bc8b56cc2306ac640a659fcc SHA-256: ad5dcfc616488d66e0f393d51e5860026de73716473348e7bb5408fa89f42060
196 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing or SEO spam campaign, indicated by the presence of numerous external links designed to redirect users. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' strongly suggest this malicious intent. While no scripts were explicitly extracted, the embedded URLs point to suspicious domains, likely serving as landing pages for malicious content or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jumiwimov.ru/award?keyword=monoclonal+and+polyclonal+antibody+pdf PDF link annotation
    • http://the-english-temple.com/european_society_of_cardiology_hypertension_guidelinest6b9n.pdfIn PDF document text
    • http://zawugudumi.getenjoyment.net/demisuvolowaje.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/carl_jung_collective_unconscious_example.pdfIn PDF document text
    • http://pixidilivutep.medianewsonline.com/do_rca_tvs_have_optical.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388062/normal_6008286edb4c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372983/normal_5ff681907f305.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369774/normal_60188c79214cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413347/normal_60072e1f04cce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481173/normal_600743c73f2a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427783/normal_5fdaa9b0d007e.pdfIn PDF document text
    • http://kubosikavudux.mygamesonline.org/81482011786.pdfIn PDF document text
    • http://7lessons.site/poruvupotofumadirazamavmljsd.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://uploads.strikinglycdn.com/files/eb584c10-de05-4e53-b7d9-226f44491a5f/9803871083.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcb02d50-d8bd-412f-afd0-f7945b91d00d/15811611826.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57283090-daa8-4792-b4fa-d90021421b55/motorola_talkabout_ms350r_2-way_radios_manual.pdfIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_517f9fe18ee2482db031d742e9143c1b.pdf?index=trueIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/blood_pressure_normal_range.pdfIn PDF document text
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_34fff600e6af4454aecaf640eba851a8.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001806c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1806C 4792 bytes
SHA-256: 09294761cd7e5959a398db4883197e3f39154fe01a22ed39ca830cd372ef20ee
font_01_sfnt_off000190cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190CD 11564 bytes
SHA-256: 4c4a64d63ea49122ade8f12647eee7e1b47e396686efc336411deb1565b81532
font_02_sfnt_off0001b84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B84D 16148 bytes
SHA-256: 43dd7310e986e37c0562d6efd2a67b6291a0d41fa892ecd43b306c3e7231f7b7
font_03_sfnt_off0001cd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD44 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176