Malicious PDF — malware analysis report

Static analysis result for SHA-256 a556131a1d646f33…

MALICIOUS

PDF

87.3 KB Created: 2021-04-11 06:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 40a7eb1b411af84f33caf7bbba540104 SHA-1: 2c636bd970284f1e2476f41ae5c13521975b1395 SHA-256: a556131a1d646f33fe115789673ba152a722d46d5ecbca36db0a7d58e898c7b3
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'resalured.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to 'Historia de estados unidos'. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://resalured.ru/strik?utm_term=historia+de+estados+unidos+resumen+corto+para+ni%25C3%25B1os PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469126/normal_606aec5085e7a.pdfIn PDF document text
    • http://lamanixumerad.mypressonline.com/47984388753.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/4gi1iir/love_you_mum_coloring_pages.pdfIn PDF document text
    • https://cdn.sqhk.co/sujubowip/ijXjiuA/bicycle_speedometer_wheel_size_chart.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410416/normal_5fd9d0fbd90eb.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzixapudel/ejbBgeT/39431277671.pdfIn PDF document text
    • https://cdn.sqhk.co/pemoxeriko/ijhhtYr/33644373810.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/igjogi7/nixotaxap.pdfIn PDF document text
    • http://bajifepeselok.sportsontheweb.net/interior_design_colleges_in_toronto_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/av1vylU/30458849351.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453551/normal_5fd1a78a0f129.pdfIn PDF document text
    • https://cdn.sqhk.co/kagelemovo/fhjhcih/pesegifiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455660/normal_6056e8811b240.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470014/normal_602d70d7e9ff3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501214/normal_5fe7725c37018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473359/normal_6052aa1b5fc5a.pdfIn PDF document text
    • https://cdn.sqhk.co/wanoposuj/GvjeigE/2363802487.pdfIn PDF document text
    • https://cdn.sqhk.co/wipedekis/gggdpib/colorblind_counting_crows_piano_sheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495240/normal_600f554fed39e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488315/normal_600f03a8a785c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nuzikenevizut.onlinewebshop.net/bpmn_2._0_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/market_leader_upper_intermediate_myenglishlab_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/how_to_use_python_classes_effectively.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/74229190901.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/1318768927.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/71306301933.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_off0001146e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146E 5360 bytes
SHA-256: 82b99a3537ec87861acb35a80f98bc953103b043c17429710e6eb37d9543cb85
font_01_sfnt_off0001264a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264A 11836 bytes
SHA-256: e75f62028324b794f82606a6971aaee3efc6788578de9d1a90a0c7758a0cd9b0

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