Malicious PDF — malware analysis report

Static analysis result for SHA-256 72aad70f610e0c45…

MALICIOUS

PDF

76.3 KB Created: 2020-12-16 22:26:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ade1bee4be1ccb79fe06ec03b5da78e1 SHA-1: 13c417c338f41097fbbd1613ac2f14aef63f5bf1 SHA-256: 72aad70f610e0c4542c0f0c40ba73bfa5a5f404eb6de68c670f3afe2aa99826d
156 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is part of a link farm and has been flagged as malicious by ML classifiers and ClamAV. The embedded URL 'https://traffnew.ru/strik?utm_term=nursing+care+plan+for+insomnia' suggests a phishing or malware distribution attempt, disguised by the document body's reference to a 'nursing care plan'. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely involving redirection to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffnew.ru/strik?utm_term=nursing+care+plan+for+insomnia
    • https://voxonevixes.weebly.com/uploads/1/3/4/3/134383310/didarifobuw-jiradu-sukasez.pdf
    • https://minaraxu.weebly.com/uploads/1/3/4/7/134765114/1510af.pdf
    • https://guvepilafofifiv.weebly.com/uploads/1/3/4/6/134682232/nasapenabinulugorer.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/wajufifenoxuj/58059084322.pdf
    • https://uploads.strikinglycdn.com/files/901141f1-8c1a-4589-ae79-04a74e2d6622/tifadaloz.pdf
    • https://static1.squarespace.com/static/5fc6d48cd64a3343a5f4b73b/t/5fd0e0d875f5e504857d438e/1607524568244/25694433803.pdf
    • https://static1.squarespace.com/static/5fc5108d5e8e827d42a8a9a7/t/5fcafd1a1ef6d1662fe6b2dd/1607138587505/77761685168.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdfb43145a8629dc7694f9/1606286148676/13355933618.pdf
    • https://static1.squarespace.com/static/5fc18f8d0a2757459be7919f/t/5fc3bede173fb5383b157d52/1606663902707/que_es_un_espiritu_de_lascivia.pdf
    • https://s3.amazonaws.com/gateme/35906307494.pdf
    • https://uploads.strikinglycdn.com/files/f38e4d4b-d6f0-4dc9-b37d-a06caab3901b/oki_weapons_designator_guide.pdf
    • https://static1.squarespace.com/static/5fce186d49d01c20c2042f2d/t/5fd19235ae71ea6dd31961ca/1607569973851/40897470946.pdf
    • https://static1.squarespace.com/static/5fc0e9eb3398ff75152e2002/t/5fc0f2abeaf37e3b64be13fc/1606480556164/sevuwemapevulajije.pdf
    • https://static1.squarespace.com/static/5fc6743f88c99b6d37cd7f20/t/5fcd1fd705ddc9599d29212b/1607278552247/jim_hopper_stranger_things_season_4.pdf
    • https://static1.squarespace.com/static/5fc551856609fd0ee7aecdc2/t/5fcb0a76190ee82df8d61a3e/1607142008279/bonitosan.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dff3.bin
9edcb89b3b55e1c87cda7076d103fb526bfe223f707908856754c06cc34be745		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF3 5104 bytes
font_01_sfnt_off0000f13c.bin
028a3eddade28f42f5ff7433898216102fa86db27afeb24d351df88490f2547e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF13C 10720 bytes
font_02_sfnt_off000115e9.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115E9 4324 bytes

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