Malicious PDF — malware analysis report

Static analysis result for SHA-256 781942d4690ee784…

MALICIOUS

PDF

111.7 KB Created: 2021-03-27 10:42:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 729aeb1d6bb787c4775c26423f359ed7 SHA-1: c51f152ac970f8c7232dddfa518fdd189bd26ebc SHA-256: 781942d4690ee7840d1555ad343c42ce12fac60984a967694978aa1b24d6ec6f
166 Risk Score

Malware Insights

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

The PDF contains multiple external links, with one specifically pointing to a website that appears to be a lure for downloading content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. ClamAV detection and ML classification further support its malicious nature, suggesting it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://lozipotod.ru/award?keyword=birbal+stories+in+urdu+pdf PDF link annotation
    • http://misitaka.iblogger.org/juzuruxowew.pdfIn PDF document text
    • https://cdn.sqhk.co/budafitanu/1jjgiij/zubirigerizadoxebifil.pdfIn PDF document text
    • http://pusosokus.iblogger.org/ternary_ionic_compounds_worksheet_answer_key.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408989/normal_6005217ac080a.pdfIn PDF document text
    • http://nejamaranidirit.22web.org/55229356248.pdfIn PDF document text
    • http://repizedozoful.sportsontheweb.net/ankle_arthritis_exercises.pdfIn PDF document text
    • http://gebigulexejo.sportsontheweb.net/rapibeteserav.pdfIn PDF document text
    • https://cdn.sqhk.co/detazido/jbhiXvv/migojugezomekinumogu.pdfIn PDF document text
    • http://retys.space/18058725235c7ean.pdfIn PDF document text
    • https://cdn.sqhk.co/sunaxidida/AhbDZjd/wokosobapukisikat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413121/normal_60031de02fefb.pdfIn PDF document text
    • http://sadinexiwa.mygamesonline.org/dumisukaj.pdfIn PDF document text
    • https://cdn.sqhk.co/sivadapexiri/gcBhbid/39380407147.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460476/normal_603854525da47.pdfIn PDF document text
    • http://dvertsoff.ru/49764496899chjur.pdfIn PDF document text
    • http://nomokesus.sportsontheweb.net/1386732521.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8e12fe21-47c1-448c-af9e-883e7c84523b.filesusr.com/ugd/52ac5e_1c8c7aa11489440da99ddc619dc25d93.pdf?index=trueIn PDF document text
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_60ee34b5ca6643ba882946e7a52cf174.pdf?index=trueIn PDF document text
    • http://tininababa.rf.gd/79917354332.pdfIn PDF document text
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_c4f1ee9bdd8841a8981870fb512fac2f.pdf?index=trueIn PDF document text
    • https://cc6d8859-fc08-4100-a073-55b48c5addfc.filesusr.com/ugd/238140_b8f3737a8eff413681351a0e2f75a4b5.pdf?index=trueIn PDF document text
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_7e3fb7caf147427ea8837bf84316ac87.pdf?index=trueIn PDF document text
    • http://vawerudarasikow.myartsonline.com/61946025667.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E3B 5224 bytes
SHA-256: d49a44bcc1b1700c799110a24bab09b11ce5824f28d78e989d498764de25604d
font_01_sfnt_off00017003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17003 13780 bytes
SHA-256: 431576072f1f40f18baf6c00b11f6785761a2308f796b96ccf97f5189bc61f5a
font_02_sfnt_off00019b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B6F 16448 bytes
SHA-256: deda6cd58da6f840a1004628a99587fe991d53bb3ebf675452392e20f1ba1a25