Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb3e2b8612063c7…

MALICIOUS

PDF

77.9 KB Created: 2021-03-24 08:05:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 508c8376dbf09d9eaa8a3736526507d1 SHA-1: bdd09ad2469e5531362b1df7e5bd5cc66e3f9b71 SHA-256: dcb3e2b8612063c7df0024d02b4fb8efcf77e833130689ace0d8a1d083ccf6c2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/award?keyword=axonal+polyneuropathy+pdf PDF link annotation
    • https://cdn.sqhk.co/kivipemo/gciihgY/luzelak.pdfIn PDF document text
    • https://cdn.sqhk.co/nububufi/fljggeD/piluwusowan.pdfIn PDF document text
    • https://cdn.sqhk.co/difigobon/ibtSmhj/85837075352.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410459/normal_60258d44791b0.pdfIn PDF document text
    • https://cdn.sqhk.co/zawileveruz/jbjeE33/yogyakarta_tourism_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/eicqHha/jogizosup.pdfIn PDF document text
    • http://xsafak.com/ada_2018_diabetes_guidelines0uv0z.pdfIn PDF document text
    • https://cdn.sqhk.co/xexanodu/Ohjf8gg/transmission_repair_shops_close_to_me.pdfIn PDF document text
    • https://cdn.sqhk.co/ropimipaf/kAjf5iZ/rolling_stones_tongue_shirt_white.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415526/normal_6040769ede895.pdfIn PDF document text
    • http://laulu-go.ru/49853490781nhwy8.pdfIn PDF document text
    • http://tamakar.xyz/zinodebezi8ponu.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/MiiPJhd/superstar_band_manager_unlimited_money_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kozutani/ehbrXhn/2049604001.pdfIn PDF document text
    • http://samo-katim.ru/15488144815mpsnc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_32b37238b200424da0aa259c5c8b3603.pdf?index=trueIn PDF document text
    • https://0a37a3d5-a0bf-4e77-8ff5-6127fd08aefa.filesusr.com/ugd/6046c9_e0e6c0548a4f48ca994fe44132605446.pdf?index=trueIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_46205427eba845d5ada1f9376e669915.pdf?index=trueIn PDF document text
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_9a3f8207e5fe430992dae6ab2d4cd717.pdf?index=trueIn PDF document text
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_0bf1eb93eb2b40d181cee30bb17322e7.pdf?index=trueIn PDF document text
    • https://44dd6259-7513-41c7-b2f1-b2b1fc385d2e.filesusr.com/ugd/63022f_7f6694bb172e42e7bed51b7cc8e7264a.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF381 5108 bytes
SHA-256: 789519a95394b6b4e7dd6073c1105e5e44e78db4e37c1a6dd5c04b64154f68d2
font_01_sfnt_off000104e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E5 11072 bytes
SHA-256: 9a8f90fddc984e2f6f28a8278693fec8026777b325f680b4afe58de49f701cf0

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