Malicious PDF — malware analysis report

Static analysis result for SHA-256 22320d9ed84b9bca…

MALICIOUS

PDF

74.6 KB Created: 2021-03-29 05:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4150b246d80c8f555ab408f196813075 SHA-1: b04d7f92a96c697cf7b355e69f0a4900b639e526 SHA-256: 22320d9ed84b9bcaedae79fecdcf0f38e48fb6abcfdf4a32833c79b78bb93a51
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized to appear as search results for legal documents. The primary malicious URL identified is resalured.ru, which likely serves as a landing page for phishing or malware distribution. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/aws?utm_term=constitucion+politica+mexicana+articulo+16
    • https://static.s123-cdn-static.com/uploads/4404725/normal_5fcf2e6bce14a.pdf
    • https://static.s123-cdn-static.com/uploads/4426954/normal_6007b65242791.pdf
    • https://cdn-cms.f-static.net/uploads/4490133/normal_601fdfdf758c0.pdf
    • https://static.s123-cdn-static.com/uploads/4500425/normal_5fc573a89976c.pdf
    • http://kexumojazo.mypressonline.com/noginotagolek.pdf
    • http://modarab.mygamesonline.org/books_for_beginning_readers.pdf
    • https://static.s123-cdn-static.com/uploads/4366364/normal_5ffbb8649f65b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kulinisokakewi/ambari_kannada_movie_ringtone.pdf
    • https://uploads.strikinglycdn.com/files/eb0bb290-767e-4721-b28a-60630f4ae1d5/honeywell_hcm350w_germ_free_cool_mist_humidifier_white_walmart.pdf
    • https://84d51d8d-5932-465a-b044-5d36dace581c.filesusr.com/ugd/98e2de_fae537d72eb4451490ffd84c8b311e47.pdf?index=true
    • https://uploads.strikinglycdn.com/files/53d2da3c-b1c9-4a95-86b5-3f432bfe07b4/88577294757.pdf
    • https://s3.amazonaws.com/jeduzizonox/zasoleronatananelaja.pdf
    • https://835a0401-7144-467e-aacc-710587930ffc.filesusr.com/ugd/432cba_426139ffbfdd4a2993e174b37d23ca51.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ab337065-0f99-4124-a3a9-4890268cbdb4/contemporary_engineering_economics_6th_edition_solution_manual.pdf
    • https://s3.amazonaws.com/pogolo/xoxevejitapuno.pdf
    • https://s3.amazonaws.com/netinuwa/latigo.pdf
    • https://s3.amazonaws.com/makixibawumebol/worth_its_weight_in_gold_cae_answers.pdf
    • https://s3.amazonaws.com/muvemasoxaji/17356008483.pdf
    • https://uploads.strikinglycdn.com/files/f0fbcfd9-14e6-469f-b5ba-855149de241f/beats_studio_1_wired_red.pdf
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_077d4fa082824f70b4d0c2cc6022e744.pdf?index=true
    • 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_off0000e4d7.bin
2283385361228103823eabc8e581adc4367943df390b5f2d6578bc7317a75720		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D7 5256 bytes
font_01_sfnt_off0000f6ac.bin
26ffe561b4c4b2cef5a3ce75551e6ba6b6a54cf8707873b076c3b986f3d97d1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AC 11024 bytes

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