Malicious PDF — malware analysis report

Static analysis result for SHA-256 a693eadb455d6a4d…

MALICIOUS

PDF

76.5 KB Created: 2021-06-01 05:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3cb142b27bff2543bd55a84777bc434d SHA-1: efa1048abec3e46cfee7284b8240feadbedc61cf SHA-256: a693eadb455d6a4d992cf2e3133aaf7a7866dfa81df5797437b5c62d20ad6f24
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF link farm. The primary URL, https://cructi.ru/pbw?utm_term=how+long+does+myofascial+pain+last, suggests a potential phishing or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent, likely related to distributing or linking to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cructi.ru/pbw?utm_term=how+long+does+myofascial+pain+last
    • https://mitegasur.weebly.com/uploads/1/3/1/8/131871816/7797adb0e5afee.pdf
    • https://konoxike.weebly.com/uploads/1/3/4/4/134445870/riwosujesewe.pdf
    • https://rikafikisejale.weebly.com/uploads/1/3/0/7/130740062/nuwegedesipim.pdf
    • https://lolimoxozidexus.weebly.com/uploads/1/3/2/6/132682882/4510142.pdf
    • https://kominuxopexazi.weebly.com/uploads/1/3/0/8/130814675/35a18.pdf
    • https://bogewugarut.weebly.com/uploads/1/3/1/4/131483108/bawuvolimat_denafibisag_bojalotezeredom.pdf
    • https://jitosagar.weebly.com/uploads/1/3/4/3/134318128/fokarinuvagotarul.pdf
    • https://noruwapawufibem.weebly.com/uploads/1/3/0/9/130969999/fijep-kupelimamaje-duzufafe.pdf
    • https://juvidefe.weebly.com/uploads/1/3/4/3/134319267/7513736.pdf
    • https://zewakifu.weebly.com/uploads/1/3/0/7/130740590/zoniz.pdf
    • https://wexotagupoma.weebly.com/uploads/1/3/2/8/132814474/2947502.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tagexoba.pbworks.com/w/file/fetch/144422745/what_to_do_if_your_sharp_tv_wont_turn_on.pdf
    • http://rujuboxu.pbworks.com/w/file/fetch/144440235/62766392548.pdf
    • http://nunaruribeg.pbworks.com/f/41160570912.pdf
    • https://uploads.strikinglycdn.com/files/3c543355-ae10-43ac-96b8-24d83486f52b/85433881708.pdf
    • https://uploads.strikinglycdn.com/files/bb9c96b6-34dd-411b-8efb-3fda269ae7d1/2361293786.pdf
    • http://lekuzax.pbworks.com/f/rapport_de_stage_reception_dhotel.pdf
    • https://uploads.strikinglycdn.com/files/59853afe-1098-42ac-9911-ca6c01dea9e5/classical_guitar_without_nails_reddit.pdf
    • http://runaliguredu.pbworks.com/w/file/fetch/144442590/71006138332.pdf
    • http://poforezufovu.pbworks.com/w/file/fetch/144434118/feromivored.pdf
    • https://uploads.strikinglycdn.com/files/0fb1b50f-bfad-4a17-838f-c1ddd57c2520/10717753900.pdf
    • http://tisowowuduwe.pbworks.com/w/file/fetch/144419127/bsc_physics_handwritten_notes.pdf
    • https://uploads.strikinglycdn.com/files/110c826e-6f5f-40b0-8148-d688e44d84b1/the_fold_deleuze_summary.pdf
    • http://wijozuzapusa.pbworks.com/w/file/fetch/144438705/12455648158.pdf
    • 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_off0000ee9c.bin
423d56edae145816b4dc6df77027cc0698505467a992fa227e857cb697824e44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9C 5532 bytes
font_01_sfnt_off00010185.bin
f048fbd43d55740a3d15128a4e721b66c04eaf64c9016ee64fa4ec56b3c5f7a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10185 10080 bytes

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