Malicious PDF — malware analysis report

Static analysis result for SHA-256 440d89ec4a25483d…

MALICIOUS

PDF

77.3 KB Created: 2021-03-17 04:57:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: d24cbfd6434f9a3f1b004a67955a1ac1 SHA-1: 19da2e7d4d2489cc03be5db793f52f396cf075a0 SHA-256: 440d89ec4a25483db19cc8142b20338f7236e9648a0eb7a377f61d89e6aea4ed
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://vilenefex.ru/award?keyword=asperger+syndrome+test+pdf PDF link annotation
    • http://delaem-sami.online/xatimagitodumituviah1rj.pdfIn PDF document text
    • http://bossyonlinex.com/pafodimibujituw31gf7.pdfIn PDF document text
    • http://najetaxu.mygamesonline.org/40k_7th_edition_rulebook.pdfIn PDF document text
    • http://vawurabel.mygamesonline.org/mediwilal.pdfIn PDF document text
    • http://mantenancie.com/42459380621kb49d.pdfIn PDF document text
    • http://uanews.website/raving_fans_sparknoteshlm7q.pdfIn PDF document text
    • http://mscredit.info/36488227855die98.pdfIn PDF document text
    • http://xupulakikovuxo.mypressonline.com/kilodipisunegoramidix.pdfIn PDF document text
    • http://kevakigev.medianewsonline.com/pofew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_0343678197ba405480f01f76c0e5b1cc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/kakeraxebuvitixagajaxok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/158bfb58-d815-4482-8d55-b2ac50e28191/15747514738.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c7063fb-b5de-4188-88ab-bfe01f36adff/37461249570.pdfIn PDF document text
    • https://0dea665b-aaaa-42f3-a52c-f86f0fd1efa2.filesusr.com/ugd/8b9728_44af7d6cf779473fb274b0bfdeafdff4.pdf?index=trueIn PDF document text
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_23277a81779846888af9e10a39895ec2.pdf?index=trueIn PDF document text
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_e62af2b36533429e8f8035f57b887c1f.pdf?index=trueIn PDF document text
    • https://01d67eed-50ba-4ccb-8f82-c1581f7ed07e.filesusr.com/ugd/e3325f_c16d0b8881c242589de06b0ae4a62e58.pdf?index=trueIn PDF document text
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_ac8019cfc1954ff7b36aa68993f79bf1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0de84e73-87b1-42a5-9851-dd6cf437e523/40702369812.pdfIn PDF document text
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_ad74f3a38a04405fb8b15b7b06231e8d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisiku/indian_chicken_curry_recipe_madhur_jaffrey.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eafae035-d2ac-4c6f-b2ba-cca33406d11b/60583869706.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2b76779-2b05-4eed-bae3-2033ac4f67fd/43859808568.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/hearthstone_arena_guide_app.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_off0000f337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF337 5212 bytes
SHA-256: bdc11990595c3c82eb7b135bc651a72781a94d3ee87ad3398c4767656a354299
font_01_sfnt_off000104ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EC 10236 bytes
SHA-256: 76fa8d01dda14133f5787f41c059a8a772b8aa19e8836e995f208ab73fe724ca