Malicious PDF — malware analysis report

Static analysis result for SHA-256 886573a9059dd0e2…

MALICIOUS

PDF

89.3 KB Created: 2021-03-02 12:41:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5bc6f56769e2615e032dd357e8afe38a SHA-1: 7504e94a064fda98cc0c2a3cd104fb7c8046889c SHA-256: 886573a9059dd0e2bdd0283d529cd00dda076c25a938e2f16ded112113bf12b7
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are hosted on disposable domains or subdomains, suggesting a link farm or phishing lure. The document's content, while appearing to be about 'multivariate regression analysis', is likely a pretext to drive traffic to these malicious URLs. The ClamAV detection and ML classifier further support its malicious nature, indicating it is likely a phishing or spam distribution document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://jottigo.ru/strik?utm_term=what+is+a+multivariate+regression+analysis PDF link annotation
    • https://zusavakaki.weebly.com/uploads/1/3/0/8/130815140/8f289.pdfIn PDF document text
    • http://liketime.online/lutogawufubutesesuvifgdppi.pdfIn PDF document text
    • https://fupakukenig.weebly.com/uploads/1/3/4/2/134234610/sujegofutedameniv.pdfIn PDF document text
    • https://cdn.sqhk.co/xekemini/icBjiBb/83913329759.pdfIn PDF document text
    • https://vemekejafor.weebly.com/uploads/1/3/4/0/134012611/novotarazogito.pdfIn PDF document text
    • http://power-guard.shop/que_es_liderar_equipos_de_trabajo10v4e.pdfIn PDF document text
    • https://litepuvib.weebly.com/uploads/1/3/4/7/134741427/tokegeferovefo.pdfIn PDF document text
    • http://rimiminigi.22web.org/zidorepotexenolibuxalib.pdfIn PDF document text
    • https://likizosuzi.weebly.com/uploads/1/3/4/8/134886942/niwabagenibun.pdfIn PDF document text
    • http://biggymstoe.com/the_stand_2020_castr4z82.pdfIn PDF document text
    • http://alphabitx.com/loferubugd0vd.pdfIn PDF document text
    • https://cdn.sqhk.co/wozepefiga/gdcje1D/yellowstone_season_4.pdfIn PDF document text
    • http://shtangelkipokupkiitd.online/fall_guys_wallpapers_4kqj2no.pdfIn PDF document text
    • https://kadilawozozupaj.weebly.com/uploads/1/3/0/7/130739633/4d498c89.pdfIn PDF document text
    • https://cdn.sqhk.co/zokuwagopole/je2ptia/4939428392.pdfIn PDF document text
    • https://cdn.sqhk.co/noneniwetav/iaPgdge/dutudimulowoko.pdfIn PDF document text
    • https://cdn.sqhk.co/nilesatu/fRvhcij/rizemoxugan.pdfIn PDF document text
    • https://jebasiju.weebly.com/uploads/1/3/1/3/131381450/vagufisovozuki.pdfIn PDF document text
    • http://fevozogu.iblogger.org/chakram_movie_video.pdfIn PDF document text
    • https://xojumupaxasa.weebly.com/uploads/1/3/4/6/134605953/267a756e7c3b941.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/86DjioP/dr_davenport_dentist_laredo_tx.pdfIn PDF document text
    • https://xakebugus.weebly.com/uploads/1/3/4/0/134018628/gasewoxubiwazes.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
    • http://sikadakomog.epizy.com/28562187040.pdfIn PDF document text
    • http://gebuvuvoxu.rf.gd/27917850272.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7B 5156 bytes
SHA-256: 9a7e6adf9940033f58dda494b2645bba0aa209ca35766bf82369ab645f514e88
font_01_sfnt_off000100e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E8 2172 bytes
SHA-256: bf1804cbcf83f836578c5dbfda0438c9899b1b6a4352db3ffc2e86e67f94985b
font_02_sfnt_off00010a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4A 11740 bytes
SHA-256: 56557cd85ac02f0db7548b5e1335534b56f6668af4a0e53e156eaacdf0772b35
font_03_sfnt_off000132cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CF 16148 bytes
SHA-256: 43dd7310e986e37c0562d6efd2a67b6291a0d41fa892ecd43b306c3e7231f7b7
font_04_sfnt_off000147c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147C6 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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