Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81cd326a626835a…

MALICIOUS

PDF

80.9 KB Created: 2021-03-10 23:49:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd31d020e9d36e7eccb6090d1ee09243 SHA-1: 7dfc31817b135eef05be23bfba6004cc4cfc674c SHA-256: e81cd326a626835a59884083ca10d272a903514ca4070e34966039e4b9cfd572
156 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which are to PDF files, suggesting a link farm or phishing attempt. The primary malicious URL, 'https://resalured.ru/aws?utm_term=where+are+the+filters+on+my+dyson+animal', is presented as a search result to lure victims. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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-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://resalured.ru/aws?utm_term=where+are+the+filters+on+my+dyson+animal
    • https://cdn.sqhk.co/tajiwikiter/3AaZgjq/mesedojukinizizilixulijor.pdf
    • https://cdn.sqhk.co/ranemagesoga/geTgghe/56788374168.pdf
    • https://cdn.sqhk.co/rupomotiz/ihjaIbR/buffer_meaning_in_tagalog.pdf
    • http://it50discount.pro/75107210054funer.pdf
    • https://cdn.sqhk.co/gejupajo/anIih1b/xiwijorosuvi.pdf
    • https://cdn.sqhk.co/pelopuxi/iftNvgg/wafowil.pdf
    • http://onsideball.info/melanipepagidikarizisadizys64a.pdf
    • http://legendnat.space/market_wizards_series_by_jack_schwagerz9a90.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6b54b0b2-91db-43cc-88c8-bbc4f7e20b37.filesusr.com/ugd/a773aa_0ea8df7a42d842a2955c7639fee35463.pdf?index=true
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_a2f56911eef94e3aa369872ebbb2692b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2a021193-fb5c-4a68-be35-207263358caf/how_long_does_it_take_to_refresh_apps_on_sky.pdf
    • https://a8a70d16-e3f0-4805-b115-4d8c62c40b57.filesusr.com/ugd/82e28d_5e8e92a3e05a416f8a5309df04eb23c5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e02dae1d-3553-4b46-9694-99c0bbc779d7/how_to_make_chicken_breast_slow_cooker.pdf
    • https://e1bd05e7-a2ed-43df-b5fc-9bc8ee0b1a84.filesusr.com/ugd/08acf3_f581bdcba3464ff8a074559bd9682afd.pdf?index=true
    • https://ac402fee-74f4-49a6-b5a4-6a03c6a057de.filesusr.com/ugd/b0cd75_053aaf7069e44a4083c6870e6361243b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e1e8e987-05fe-4ebe-96a3-a3f9c1bf55fb/21342632033.pdf
    • https://28ed73df-463f-41d7-bc87-4635118fd8e0.filesusr.com/ugd/74acc8_e45d88b7db6a44f7b1bb1efdd37cf48b.pdf?index=true
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_6126f962bf8849c685fbfaa36513897a.pdf?index=true
    • https://0306adf0-382e-42f1-903d-71c3961c97f1.filesusr.com/ugd/7ff653_53688b6aba054dcd83390fcf169a1565.pdf?index=true
    • https://56f9ebfc-1b58-4ccd-90b9-24793863e956.filesusr.com/ugd/0f3536_3d6728600006445691aa2cc8493e54c2.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3a1.bin
e0672ec8471e0a2ce48b9f36d51f1ffcb2cc931e5aa0a23196b5b1a5e6b9a360		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A1 5260 bytes
font_01_sfnt_off00010568.bin
2f8865cd517166b6afcd3b9836777025a7d2bb7f62ad679ee90b64b29fcd0ffe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10568 2712 bytes
font_02_sfnt_off00011105.bin
9607ec5d2b0e59210c72f8d1e229c1802c8efa229800bb5a32c17a2d2947ab27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11105 10656 bytes

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