Malicious PDF — malware analysis report

Static analysis result for SHA-256 de78d5e8a13127b8…

MALICIOUS

PDF

93.4 KB Created: 2021-09-10 01:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2fd09a42298847d9228d249dc30f362d SHA-1: 94a54a90c709e5310800a75fe913653afd2334fd SHA-256: de78d5e8a13127b8d1413604a15a7a5974e589737e66c08b573a0f5fcdbf29fd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to suspicious domains, and exhibits link farm characteristics. The presence of external URIs suggests an attempt to redirect the user to malicious content, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jmcoverseaspvtltd.com/uploads/files/muxovawosabubuze.pdf
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/34465480956.pdf
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/kalasikiwaxafejisaduvum.pdf
    • https://ceccarmehedinti.ro/userfiles/file/15935808926.pdf
    • https://nyig.com/files/file/89303192637.pdf
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/41334283159.pdf
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/65294561483.pdf
    • http://pk.mo/userfiles/file/depetazomezufokojowat.pdf
    • http://bekescsaba.varosom.hu/userfiles/files/77495418252.pdf
    • http://amindoost.ir/images/upload/files/72912880965.pdf
    • http://hanasushipickup.com/uploads/files/devuvubuxelupuju.pdf
    • http://chochosanencino.com/uploads/files/wapirazegekoxozaginotu.pdf
    • http://ptaki.info/imgekoprojekty/files/57255542075.pdf
    • http://viettranslators.com/webroot/img/files/muxokamumisusafefo.pdf
    • http://mobil-tech.com/files/bobuzekisorunujujuzuneva.pdf
    • http://vitanova-cattery.com/upload/file/vurepokomoxez.pdf
    • http://matraholding.hu/images/userfiles/files/89537848004.pdf
    • http://ncfc.com.tr/ckfinder/userfiles/files/wibubuvasiwo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+hobbit+full+book+pdf+download
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010482.bin
86a0f314c307f03b6fedfc33ee1d842a5aa40d16edd8aa52fbe3bd21c0c99a36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10482 10708 bytes
font_01_sfnt_off00011cd0.bin
e48bf34628bf1624a442caeb3d1d7ad2cc7bc19e9ff2f779cf72a3776ff79e72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD0 19756 bytes
font_02_sfnt_off0001502e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1502E 16792 bytes

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