Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb55a4a473ea879c…

MALICIOUS

PDF

70.8 KB Created: 2021-02-18 10:08:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: e6e276fccd62f4925e5a64e4f08e96dc SHA-1: 3a1c6f9dfbf030d9331fd9f04ebbede73d5180f5 SHA-256: fb55a4a473ea879c5fe08e54040fd8720fd6f782c542c94de2f930dbf6f76459
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic indicating a link farm. The primary URL, 'https://maypoin.ru/wix?keyword=point+slope+equation+worksheet', suggests a lure related to educational content to drive traffic. ClamAV detection and ML classification confirm its malicious nature, likely for phishing or SEO spam.

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 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://maypoin.ru/wix?keyword=point+slope+equation+worksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4469136/normal_600400d9b00c2.pdfIn PDF document text
    • https://tebafazar.weebly.com/uploads/1/3/4/2/134265880/zebubusububofazo.pdfIn PDF document text
    • http://poroda.site/zemokaxkeavm.pdfIn PDF document text
    • http://nowatora.22web.org/ff14_desynth_leveling_guide.pdfIn PDF document text
    • https://worubagazew.weebly.com/uploads/1/3/4/6/134639575/8642393.pdfIn PDF document text
    • http://copyrighytsupport.com/41246273435bcd8f.pdfIn PDF document text
    • http://zoomita.space/how_to_subscribe_with_twitch_prime_on_mobile_app8a713.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/topisez.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/31443180389.pdfIn PDF document text
    • http://lexaxixamu.rf.gd/repifitagiranelodat.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/sorasumufef.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/soundcloud_go_plus_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/39200538626.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/42112868300.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/antes_que_sea_tarde_vicente_garrido.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/working_bedwars_map.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_off0000da8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8A 5188 bytes
SHA-256: 335162009ac98ac5d6381e4d54734badc4f2750bd8684291ffe36fcfd81c827a
font_01_sfnt_off0000ec3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3D 9888 bytes
SHA-256: 456cdf0f5f04329d2652d82b240aef3bf2e5bb0d23b9baebe80b1193e7edac5d

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