Malicious PDF — malware analysis report

Static analysis result for SHA-256 69d5aa2eb1afd944…

MALICIOUS

PDF

82.0 KB Created: 2021-03-15 09:14:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a43c171c8f7e0af80e63bed74330e317 SHA-1: 7d3c958a82d35aeea2c09dfd7556339618184468 SHA-256: 69d5aa2eb1afd944886d5dc8b271df7900b5dbad518c7f1f96861fa675d82231
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to suspicious domains, and is flagged by ClamAV as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to educational worksheets, which is a common tactic for phishing campaigns. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/wix?keyword=combining+like+terms+coloring+worksheet+pdf
    • https://static.s123-cdn-static.com/uploads/4455178/normal_5fe0c3003c5bc.pdf
    • https://cdn.sqhk.co/zijigemeworu/blJFgju/mupazepuvobagituguxefa.pdf
    • https://cdn.sqhk.co/delopomixaba/LjiLAq5/56498192433.pdf
    • https://wunogalabapa.weebly.com/uploads/1/3/4/6/134603674/foremitowabiboto.pdf
    • https://cdn-cms.f-static.net/uploads/4378853/normal_603678511b247.pdf
    • https://cdn.sqhk.co/wevexifimur/jYijcN6/wuwagigobupudifoliwi.pdf
    • https://cdn.sqhk.co/limizolaxa/gdjgigl/9923210761.pdf
    • https://cdn.sqhk.co/kogoruzojif/sgesiJr/kexesenijigafasi.pdf
    • https://tijesefufejeje.weebly.com/uploads/1/3/4/8/134858706/buwagenavumo.pdf
    • https://cdn.sqhk.co/toneribabut/fhijege/family_chat_whatsapp_names.pdf
    • https://cdn.sqhk.co/xarozowuzosa/gfijIic/nujugibasutupo.pdf
    • https://cdn.sqhk.co/nakunadubux/jjhemjh/bombay_sapphire_cost.pdf
    • https://cdn.sqhk.co/telupiza/hiifeie/the_wolf_chinese_drama_recap.pdf
    • https://static.s123-cdn-static.com/uploads/4392668/normal_5fe54305a3115.pdf
    • https://cdn.sqhk.co/gevagedubop/kJl80gc/10253840112.pdf
    • https://rowiteruna.weebly.com/uploads/1/3/4/4/134470704/bewupiwezogel-gigetosu-wapan.pdf
    • https://cdn-cms.f-static.net/uploads/4476443/normal_5fe9420b77f42.pdf
    • https://xiliperudal.weebly.com/uploads/1/3/3/9/133999468/dupab_tasuzejafaka.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/wofaxil/descriptive_quantitative_research_examples.pdf
    • https://s3.amazonaws.com/webipejonavuv/best_way_to_get_rid_of_wine_belly.pdf
    • https://s3.amazonaws.com/nuxulikiwab/kansas_city_antenna_tv_channels_guide.pdf
    • https://s3.amazonaws.com/xovajukoxin/28441823488.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_off0000f19d.bin
da08d099dd7ea053b6260e9a42bc029fb2d77a64e68944a12936fe430d985593		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF19D 5464 bytes
font_01_sfnt_off0001041a.bin
01fdcdd8f3fbc90a81d266513ef5a695da3a3a18950e829fbe2499b3bac9789f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1041A 11784 bytes
font_02_sfnt_off00012c4e.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4E 4324 bytes

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