Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b1fa8e27af8b5dc…

MALICIOUS

PDF

78.5 KB Created: 2021-03-25 02:50:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c06f382e09c21959ae6c007b63122f24 SHA-1: 6ca12d003378ae56f5e17d193ba58411fa759209 SHA-256: 0b1fa8e27af8b5dcf5d9a07ea0e5455158a6a470e3017e2e6af3e35fd0ec5b2e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. ClamAV and ML classifiers also flagged this PDF as malicious. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest the document's purpose is to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/123?utm_term=browser+android+flash+player+integrato
    • http://tizezs.xyz/ohms_law_practice_worksheet_answer_keypfpst.pdf
    • https://nepuvojikonutoz.weebly.com/uploads/1/3/4/6/134677469/afd88a6.pdf
    • http://jefuxifutubanal.iblogger.org/20674599637.pdf
    • https://diziwupufetut.weebly.com/uploads/1/3/4/4/134477772/8616697.pdf
    • http://xadimilok.iblogger.org/17088297984.pdf
    • https://zugasemoz.weebly.com/uploads/1/3/4/5/134593751/9022313.pdf
    • https://static.s123-cdn-static.com/uploads/4527357/normal_60062e94391d9.pdf
    • https://cdn-cms.f-static.net/uploads/4402720/normal_601f5c4cc456a.pdf
    • https://popetebebulexu.weebly.com/uploads/1/3/4/3/134316921/kisutom-tixufeku.pdf
    • https://cdn-cms.f-static.net/uploads/4369901/normal_6034954e17a75.pdf
    • http://copyrightmediahelp.com/53386619037lsq19.pdf
    • https://duniterete.weebly.com/uploads/1/3/4/6/134690204/aa2ab63cd8ed.pdf
    • https://feranipadolop.weebly.com/uploads/1/3/2/7/132740228/285b3214e8139df.pdf
    • http://zugoruvupigit.iblogger.org/tujurajutezej.pdf
    • http://hurleyshamburgers.com/what_to_reply_to_a_one_word_textstd80.pdf
    • http://socialwave.me/how_to_write_a_poem_about_yourself_in_third_personagyu7.pdf
    • https://static.s123-cdn-static.com/uploads/4392463/normal_5fded8a26d842.pdf
    • http://difedoko.22web.org/irregular_verbs_spanish_present_perfect.pdf
    • https://fixajunize.weebly.com/uploads/1/3/6/0/136051507/lafora.pdf
    • http://sanasesuj.iblogger.org/brother_project_runway_limited_edition_xr9500prw_manual.pdf
    • https://gurawibozogudex.weebly.com/uploads/1/3/0/7/130739732/e739ce495.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://goromanoza.rf.gd/who_does_god_think_i_am.pdf
    • http://suletemusapiw.rf.gd/sobokafupukozizejofuvif.pdf
    • http://bipolewajavovad.epizy.com/96246940466.pdf
    • http://judawuzosivope.rf.gd/14735918471.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f54b.bin
fd3db25e57f3d76cf130bf3d34f48ff0968c9ab08479b0e0570525210c9575a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF54B 5544 bytes
font_01_sfnt_off0001083e.bin
eeccc8fe64a506c4c762c0d2c82d12cd4a41d60ed3691bdbc0b19f1bd7a77446		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1083E 10500 bytes

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