Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef2dcc801f832686…

MALICIOUS

PDF

73.4 KB Created: 2021-02-19 22:46:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cefdaf564047e2e873842173c335b1c0 SHA-1: 5fd78d515c0346977230b4cd87a1ab30df473aa5 SHA-256: ef2dcc801f832686958ae7fec74fa914b3b351a2f135779938ac25bf51289bb6
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically identified as a link farm and another pointing to a URL suggestive of a money-making scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are typical of phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://druttle.ru/wix?keyword=best+url+shortener+to+earn+money+2019
    • https://wojewifonutej.weebly.com/uploads/1/3/4/8/134883442/nigokuke-wujivibu.pdf
    • http://tapabafana.22web.org/gifusukat.pdf
    • https://wabezapodila.weebly.com/uploads/1/3/1/4/131437306/zagalema.pdf
    • http://fazojum.66ghz.com/el_bautismo_cristiano.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://madulisi.epizy.com/twitter_video_indirme_apk.pdf
    • https://s3.amazonaws.com/zuvovoxigumuz/cooking_merit_badge_requirement_1_answers.pdf
    • http://zilidezokap.epizy.com/20304216734.pdf
    • https://s3.amazonaws.com/purufiz/50637997735.pdf
    • http://gipatoxusopupos.epizy.com/sedukarimubin.pdf
    • https://s3.amazonaws.com/jixerubowi/88102426138.pdf
    • http://mexexumekevuk.rf.gd/voice_recorder_free_for_windows_8.pdf
    • http://sujuxokilir.epizy.com/chief_clinical_informatics_officer_job_description.pdf
    • http://numivonef.rf.gd/relanefofigubaj.pdf
    • https://s3.amazonaws.com/zoxewudunigus/new_south_movie_film.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_off0000e214.bin
b3f35ae651a311f8a525d59661a0dab2264c47aac2cc82772762ccc05d5f554f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE214 5556 bytes
font_01_sfnt_off0000f4d1.bin
178e0b511a6ecb99a7f29ef69600e1453bfe043cc33d47a5c80fec6dbce60c8d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D1 10616 bytes