Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ff16ee1e7d6b98d…

MALICIOUS

PDF

76.1 KB Created: 2021-04-04 04:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b65ba2e21a812744b67cbd311c67e3ab SHA-1: df01f86b061e05560970d909544c1efe0ba2bdf4 SHA-256: 1ff16ee1e7d6b98dbf2b7d0bceb74126e4f987e434699a2b9fe466d9345de496
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a 'PDF_SEO_LINK_FARM'. The document body, though heavily obfuscated, suggests a lure related to 'Energy in simple harmonic motion lab answers'. The presence of external links and the ML classifier's high confidence score indicate a malicious intent, likely to redirect users to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/wix?keyword=energy+in+simple+harmonic+motion+lab+answers
    • https://cdn-cms.f-static.net/uploads/4473890/normal_605e0a856a33b.pdf
    • https://sefubokadizafa.weebly.com/uploads/1/3/4/8/134880044/5379889.pdf
    • https://cdn.sqhk.co/tokexinolelu/djhuQjj/uae_exchange_online_transfer_promotion.pdf
    • https://cdn.sqhk.co/letarezetap/CtjdgtM/fast_money_halftime_report_cnbc_fix.pdf
    • https://cdn.sqhk.co/kitujesijak/J1gjbOe/peekapoo_size_chart.pdf
    • https://cdn.sqhk.co/tunuravaxoxi/WQ3bhgI/digi-_key_catalog_2011_section-_b.pdf
    • https://watorixaziju.weebly.com/uploads/1/3/4/5/134586039/3466216.pdf
    • https://toxinezewam.weebly.com/uploads/1/3/1/4/131452950/godexa_ranenona.pdf
    • https://giruwaferelesed.weebly.com/uploads/1/3/4/8/134850821/1a040ca1c4.pdf
    • https://gudugobaxav.weebly.com/uploads/1/3/4/5/134500737/burodedevumedatawew.pdf
    • https://cdn-cms.f-static.net/uploads/4482415/normal_6040b8e4934b5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jemazejodep/30490614414.pdf
    • https://s3.amazonaws.com/julexekubaj/bakery_near_me_sheet_cake.pdf
    • https://s3.amazonaws.com/bagokiko/leaning_on_the_everlasting_arms_sheet_music.pdf
    • https://s3.amazonaws.com/sizadagazagaj/zumivavor.pdf
    • https://uploads.strikinglycdn.com/files/e3cc981b-7920-46bc-9b9f-3823add7e7a4/99847952731.pdf
    • https://uploads.strikinglycdn.com/files/f0c7ff3f-1c1e-4bce-91bd-b26d7a19f26e/bupewizejatisumokawo.pdf
    • https://uploads.strikinglycdn.com/files/3ad3e9c5-d9e1-42f4-9290-19027a781784/22584736296.pdf
    • https://s3.amazonaws.com/vibuvomomuv/blank_calendar_template_2019.pdf
    • https://s3.amazonaws.com/dutimajizowa/39240439426.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8af.bin
a2abbb25b49e74c73e981013437526d2ff4be38f7f8268d782d893db0845d842		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AF 5640 bytes
font_01_sfnt_off0000fbc5.bin
261083a40e3c8cf0889031876f0ede75c23b11204226be4f070534eafc22d35d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC5 11024 bytes

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