Malicious PDF — malware analysis report

Static analysis result for SHA-256 af8d2d271df8c36f…

MALICIOUS

PDF

82.4 KB Created: 2021-02-21 18:41:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bdf5993afd0b208a9f3a27f83b6e62b8 SHA-1: 889a4b127c3950f7e199a30b006c92bfb686cbd8 SHA-256: af8d2d271df8c36f499d3f1a631f0b7eb35d653906b21e38c2a80a1147a1a0ef
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to PDF files hosted on services like Weebly and CDN providers, suggesting a link farm or redirection mechanism. The document body, though partially corrupted, contains a title related to essay writing, likely a lure to disguise the malicious intent of directing users to these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://druttle.ru/123?utm_term=how+to+write+an+essay+conclusion+for+university PDF link annotation
    • https://xulavuxedipi.weebly.com/uploads/1/3/4/0/134017657/4271699.pdfIn PDF document text
    • https://sidopaxabu.weebly.com/uploads/1/3/1/3/131398246/9f817ec506de.pdfIn PDF document text
    • https://gefivogixofix.weebly.com/uploads/1/3/0/9/130969648/0cb9a33.pdfIn PDF document text
    • https://cdn.sqhk.co/fazologim/gjijbij/9-_12_months_size_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/zidulibu/jzFjcao/amazon_prime_video_sign_in_sony_tv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460243/normal_5fdc3fb5f0021.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450870/normal_6009534c2cdbe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477379/normal_5fe5f881af304.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496602/normal_5feb973d20191.pdfIn PDF document text
    • https://lonoguvuxa.weebly.com/uploads/1/3/5/3/135320471/xiwobo-gevam-sewur.pdfIn PDF document text
    • https://zuwadakake.weebly.com/uploads/1/3/4/6/134664894/eace9e.pdfIn PDF document text
    • https://tegidaweriwasul.weebly.com/uploads/1/3/1/4/131483440/b40f528ea0c.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/3fCxFZj/nosamagegu.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopiroxab/hhSCgcm/fruit_ninja_apk_download_uptodown.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459180/normal_5fefdd77cddde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472766/normal_60304ce256b7a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474736/normal_5ffcf4f2e0518.pdfIn PDF document text
    • https://xufipenisugiw.weebly.com/uploads/1/3/0/8/130873979/333485.pdfIn PDF document text
    • https://bifukedupojuxi.weebly.com/uploads/1/3/4/4/134498794/didifaxidewori_moviwizuneji_wadaj.pdfIn PDF document text
    • https://cdn.sqhk.co/xavonepez/hJggrgg/motorcycle_shop_near_me_open_on_sunday.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001060c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060C 5088 bytes
SHA-256: 43c2ff00ce8c6c6c285d15ed29a9b658b1e885739c5de4398801a929bd8598d0
font_01_sfnt_off00011789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11789 10608 bytes
SHA-256: 2e5a35b8355552f37cee0150f04644add4184d80a4b3a839ad071462a34e0d55

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