Malicious PDF — malware analysis report

Static analysis result for SHA-256 839335f4ebaf15cf…

MALICIOUS

PDF

77.5 KB Created: 2021-06-11 21:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb5902b60d28e5c48465aaff693947ab SHA-1: 22c8fc59429fd36d5a2469032aebd7d9fdd50fcf SHA-256: 839335f4ebaf15cf2e7b04f8be4d6035163820feea19c36d95f6dc7ba1cfcae1
96 Risk Score

Malware Insights

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

The file is identified as malicious by a machine learning classifier and ClamAV with a high confidence score. It contains an embedded URL pointing to a suspicious domain, which is a common tactic for phishing or malware delivery. The document body, though heavily obfuscated, suggests a context of measurements, likely a lure to encourage interaction with the embedded malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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://drafthe.ru/pbw?utm_term=3+nm+to+inch+pounds
    • https://static.s123-cdn-static.com/uploads/4486353/normal_600954164d09d.pdf
    • https://cdn-cms.f-static.net/uploads/4480414/normal_60599fcec50f4.pdf
    • https://cdn-cms.f-static.net/uploads/4494436/normal_604f956f98e03.pdf
    • https://cdn-cms.f-static.net/uploads/4424361/normal_60ba93ab65744.pdf
    • https://cdn-cms.f-static.net/uploads/4454301/normal_6046ef222c745.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wirajudukim.pbworks.com/f/nedemiforopuxe.pdf
    • https://uploads.strikinglycdn.com/files/d81c5da4-c05b-49a5-9bd6-4eb2fe625746/washing_machine_repair_service_near_you.pdf
    • https://uploads.strikinglycdn.com/files/056f3d49-fc5a-4b99-865a-18427484cc46/kugonegoji.pdf
    • https://uploads.strikinglycdn.com/files/2d6c14ee-eb5b-4cdc-942f-bd5c368197c2/77469387519.pdf
    • http://pexovobef.pbworks.com/f/94673919711.pdf
    • http://wiliser.pbworks.com/w/file/fetch/144557346/zeluzekotaseluzilum.pdf
    • http://rugewenuzed.pbworks.com/f/bexetujepewunebanaxix.pdf
    • https://uploads.strikinglycdn.com/files/7885f684-b51d-45c9-aa91-4f49619eb3d8/15112437137.pdf
    • https://uploads.strikinglycdn.com/files/9f60b12e-acec-472d-bfce-61b8e494dd77/how_many_chapters_are_in_the_count_of_monte_cristo_abridged.pdf
    • http://dokadeku.pbworks.com/w/file/fetch/144831387/tirux.pdf
    • https://uploads.strikinglycdn.com/files/c6fc0555-51a4-4f6f-8fc9-bf1a0e7a74b5/how_to_practice_krav_maga_at_home.pdf
    • http://vejivab.pbworks.com/f/54930312115.pdf
    • https://uploads.strikinglycdn.com/files/d4aeb9e2-6900-4799-ad91-dfefc0adfa3f/dragon_age_origins_leliana_romance_guide.pdf
    • https://uploads.strikinglycdn.com/files/d01aada2-2296-42a6-ace1-742e0324577a/microsoft_office_365_crack_apk.pdf
    • http://nunaruribeg.pbworks.com/w/file/fetch/144416148/cash_flow_diagram_template_excel.pdf
    • https://uploads.strikinglycdn.com/files/475faa66-d27a-4dd1-b0a8-a90b96d17e5e/govinda_hari_govinda_venkataramana_govinda_ringtone_download.pdf
    • https://uploads.strikinglycdn.com/files/ca16c669-9df8-4bd2-99d5-48de34c1b23b/52958412628.pdf
    • https://uploads.strikinglycdn.com/files/63fef17d-eb7f-4644-a290-4c398082e7c1/resodoto.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_off0000f35f.bin
a8b3c74ff044d2824272a30a20887989725faf6fef89365f53115bdc093be400		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF35F 5044 bytes
font_01_sfnt_off00010466.bin
e2f7a6d8fcdfe283608cfbc9dabd65578ca386e1ad01872ed9eb038153e81ae4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10466 10748 bytes

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