Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b4d9c25720c1cdf…

MALICIOUS

PDF

83.4 KB Created: 2021-03-20 06:04:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d57cc02ae9303ad876b549352ca5ef86 SHA-1: 9cca505553f9da05f97166d59686a9cef06cb842 SHA-256: 9b4d9c25720c1cdf50ce053655f8edeace48138ad6bb5cdad708ccd7bded45d6
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://xajibur.ru/wix?keyword=choose+your+weapon PDF link annotation
    • http://jsexj.fun/rounding_numbers_grade_5_worksheethqqpa.pdfIn PDF document text
    • http://1xbet-registr.site/21707122571ohanr.pdfIn PDF document text
    • http://myfirstsite.xyz/how_to_dress_like_damon_salvatorell5yr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388841/normal_5fc815ff33707.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489411/normal_5fec35535fee8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368763/normal_5fe0e363121e5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_9d8cf54854d0460482f17acb40dd0c7d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/lotus_flower_blooming_video.pdfIn PDF document text
    • http://jipegutakaxe.rf.gd/3d_car_design_app_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/demulugimaduriradis.pdfIn PDF document text
    • http://kotafonapajawut.epizy.com/75111678266.pdfIn PDF document text
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_64e3966dce404699b60678afffdd91ad.pdf?index=trueIn PDF document text
    • https://aa6d2f86-95e2-42cc-897e-6bbd71c3a116.filesusr.com/ugd/78daac_68a3f0fe931947548a4ce93cdff3f3ff.pdf?index=trueIn PDF document text
    • http://japubonaxepesi.rf.gd/ritusasedekemibo.pdfIn PDF document text
    • http://nuzimafap.rf.gd/bein_sport_live_android_tv.pdfIn PDF document text
    • https://5e024257-ca51-40df-b6b5-a3104c7b7124.filesusr.com/ugd/97368a_763b9eb15c08464590d8ee6db326de05.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mefovu/sl_blend_worksheets_for_kindergarten.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/como_rezar_la_corona_de_adviento_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/nijekefexaponira.pdfIn PDF document text
    • http://kidogip.epizy.com/xavil.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/frame_analysis_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/gefezufa.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/bhaskara_wheel.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/math_algebra_with_answers.pdfIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_89725e11376a46f18258207bad81c1c3.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C4 4848 bytes
SHA-256: 52c1ca70628bfc44816631b4fc9cefc1088183e5057370bfc4cadbe3a7127d30
font_01_sfnt_off00010a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A42 11088 bytes
SHA-256: 86ed9ebb45a3173dc84060c355382119983f6907230e9088606474db695175d0
font_02_sfnt_off0001301b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301B 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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