Malicious PDF — malware analysis report

Static analysis result for SHA-256 379c2998c183199a…

MALICIOUS

PDF

75.8 KB Created: 2021-04-01 00:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f3fec022f960385b1ff05debf9034aa4 SHA-1: dd518cd4e992346e49cc16d627877ff442f65f50 SHA-256: 379c2998c183199a7a6746e0606d3fd05a666c3a123c8416b90a15a4c9939984
134 Risk Score

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=nandroid+backup+extract+apk PDF link annotation
    • https://zovitixakozi.weebly.com/uploads/1/3/1/4/131483416/e507e46f6e78.pdfIn PDF document text
    • https://narepugajud.weebly.com/uploads/1/3/0/7/130775299/9073876.pdfIn PDF document text
    • http://tifebozazam.iblogger.org/jepowajubogebupiwabodol.pdfIn PDF document text
    • https://sevisexabokiro.weebly.com/uploads/1/3/1/6/131637038/694984ba.pdfIn PDF document text
    • https://zudimawavisutet.weebly.com/uploads/1/3/1/6/131606198/bc991c9dc81f066.pdfIn PDF document text
    • http://gidipijamufejan.22web.org/dusodisikegafidap.pdfIn PDF document text
    • http://vipogomer.iblogger.org/how_do_you_change_the_batteries_in_a_stealth_cam.pdfIn PDF document text
    • http://xajozixav.iblogger.org/cobra_walkie_talkie_cxt145_reviews.pdfIn PDF document text
    • http://najaruwa.iblogger.org/second_and_third_conditional_worksheet.pdfIn PDF document text
    • https://vabeluzaxudi.weebly.com/uploads/1/3/4/8/134884936/nesunopevisusul-ladawanukat-depadopa-ziwodaxegafoj.pdfIn PDF document text
    • http://fesebenawasoz.iblogger.org/najiguzoludasu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wozunajovufati.rf.gd/phrase_and_sentence_worksheet_grade_1.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/pajedipuvitupe.pdfIn PDF document text
    • http://lekekavom.epizy.com/87710425530.pdfIn PDF document text
    • http://bekonoxidolu.rf.gd/10495504679.pdfIn PDF document text
    • http://mobosefevexaxep.rf.gd/mawajapo.pdfIn PDF document text
    • http://damusoborubumo.epizy.com/cooper_kupp_injury_report.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/letalie_brnik_informacije_za_potnike.pdfIn PDF document text
    • http://girifej.epizy.com/10968398243.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/tukobinetodujamumu.pdfIn PDF document text
    • http://tevuxut.rf.gd/sample_minutes_of_meeting_template.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_off0000d666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD666 5100 bytes
SHA-256: 22d481a692e6debbd0b23231855cc8031896dd287bc661d0364169f3f37d820a
font_01_sfnt_off0000e7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CF 11076 bytes
SHA-256: aa5cb63c4d424e43aa2cbc6fd2788a0a6de888661ca909bb96130e16c582d77f
font_02_sfnt_off00010d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D08 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073