Malicious PDF — malware analysis report

Static analysis result for SHA-256 d48ed162c1038b73…

MALICIOUS

PDF

67.3 KB Created: 2020-12-18 15:55:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e5c7158e6a49dcc1a0c6335d828ead90 SHA-1: 7abe0497cdcab97aa184538425a000fce3c59510 SHA-256: d48ed162c1038b733137c1288c96025dfb670a771bbdc5583090483ed82321f4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many hosted on disposable domains, and is flagged by heuristics as a link farm and a phishing/malicious document. The presence of external URIs and the ML classifier output strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/strik?utm_term=knights+of+columbus+scholarship PDF link annotation
    • https://vamalogobiw.weebly.com/uploads/1/3/4/6/134696595/2427069.pdfIn PDF document text
    • https://vebifejelib.weebly.com/uploads/1/3/0/7/130775119/rudixuxofub_mukagikaji_lozotipar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408197/normal_5f9ea8250974b.pdfIn PDF document text
    • https://xokafewapi.weebly.com/uploads/1/3/4/4/134488510/4420597.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385613/normal_5faad4f768fb8.pdfIn PDF document text
    • https://nevutero.weebly.com/uploads/1/3/4/7/134716167/sisibaremewevugeb.pdfIn PDF document text
    • https://sogatetemurus.weebly.com/uploads/1/3/4/3/134379625/1808719.pdfIn PDF document text
    • https://wubobuxidozexe.weebly.com/uploads/1/3/4/3/134322977/5279075.pdfIn PDF document text
    • https://rurizurerenudiw.weebly.com/uploads/1/3/4/6/134649160/wudasotojosoduxulag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/35620d8f-ab52-4904-9442-affe3331ae82/41164243615.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc39e3c5e8e827d429ee1bf/t/5fc420e7f3de5e49b5e6a979/1606688999994/plum_pie_recipes_epicurious.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1cbe78ef7301f8b171054/t/5fd0b2b5125f6a657a52f186/1607512758555/dateline_detective_story_killer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad42134f-da10-46bb-a44a-cde172deae01/645_area_code.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA56 5536 bytes
SHA-256: b3120039c9f4bf77adf9c4b928280b3384872d7cde5a691d5e992ea8eb512566
font_01_sfnt_off0000dd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0E 10532 bytes
SHA-256: 8a0be6727df38f88e60118f006d2a2805c67ac7099c18ae2b2381a16f3205c7d

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