Malicious PDF — malware analysis report

Static analysis result for SHA-256 e509f1056da8d245…

MALICIOUS

PDF

78.8 KB Created: 2021-02-03 06:27:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 179108545ef1f15f1b67373bbbe17fda SHA-1: e56a70d59ae34bc7303fb3ad862f0acc48c5fa62 SHA-256: e509f1056da8d245fc23d5ed3c74321988ed3ebeb2525b504416da54b08c6006
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URLs, many hosted on disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • 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://jacksth.ru/123?utm_term=the+ffa+creed+by+em+tiffany PDF link annotation
    • http://eliyalte.com/hovercraft_battle_arena_wikize590.pdfIn PDF document text
    • http://austritkfa.com/76117542568ljdlk.pdfIn PDF document text
    • https://jewukezi.weebly.com/uploads/1/3/0/9/130970006/tunonapuvixafo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495042/normal_5fdec68e6216f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377935/normal_5ffe83adcb8a0.pdfIn PDF document text
    • https://mavipevawifuduv.weebly.com/uploads/1/3/4/5/134598931/makibunu.pdfIn PDF document text
    • https://mavitebe.weebly.com/uploads/1/3/1/1/131163983/tudovazuten.pdfIn PDF document text
    • https://woziwapimarezex.weebly.com/uploads/1/3/5/4/135400795/zemuvakekosajegedo.pdfIn PDF document text
    • http://mabay.fun/rofewimepodatkvnv1.pdfIn PDF document text
    • https://xawavefite.weebly.com/uploads/1/3/4/6/134667803/4061780.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454302/normal_6015e8d6854d1.pdfIn PDF document text
    • https://lerasakob.weebly.com/uploads/1/3/2/6/132682990/rozotubugasipa_nulavit_wogugonukedeb_lemafofamobo.pdfIn PDF document text
    • https://dolibaradodusop.weebly.com/uploads/1/3/4/5/134595809/bodolefem.pdfIn PDF document text
    • https://refefutetolesom.weebly.com/uploads/1/3/4/8/134868450/f52255774b3.pdfIn PDF document text
    • http://delayikapy.xyz/rusty_memory_survival_apk_modac1e1.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://s3.amazonaws.com/jobavo/53273496203.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/im_albatraoz_song.pdfIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/abdominal_muscle_strengthening_exercises.pdfIn PDF document text
    • http://biborufa.epizy.com/traduire_anglais_francais_gratuit.pdfIn PDF document text
    • http://tepokubomime.rf.gd/il_bacio_di_arditi.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/meningitis_encephalitis_guidelines.pdfIn PDF document text
    • http://sanaxumidi.epizy.com/77665760214.pdfIn PDF document text
    • http://dunuruzofugavix.rf.gd/33984844279.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEE 4920 bytes
SHA-256: de6fe6de2fc7bc0c5ceba8c08979074c1454019ac457c20579a1be11398b8250
font_01_sfnt_off0000fb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB86 10624 bytes
SHA-256: ae8018bf5ec8c19910f7de0876f2761b1f23ba7b516782d45e52081bc4aed24f
font_02_sfnt_off00011fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA8 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3