Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac47bb12cfb458a3…

MALICIOUS

PDF

81.7 KB Created: 2021-09-12 01:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1154755f35466ad838b8f368b5dd1db7 SHA-1: a6112ead0f6ee85a35aecaf6754178f64dfc657e SHA-256: ac47bb12cfb458a3bebd091a736ae424f1c30c394c84957525169d450fb1c938
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains a large number of embedded URLs, many of which point to disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://cructi.ru/uplcv?utm_term=backend+android+studio PDF link annotation
    • https://x-leather.com/radsportfiles/file/nuwugamuvizagazexab.pdfIn PDF document text
    • http://mextro.de/upload/files/73976374928.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/wasazinorututupovor.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/jamoxojapupimupenu.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/simominugavejixadunafoli.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/27092786814.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/tipegokana.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/31171211331.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/wemalavuwolojasumexogu.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/120026739161378b0cc288f.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ae3395d0c337109299e23db3492963dc/pogekoze.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/karopewopezuwoki.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210901_10929AD33BF16CBD.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/91689369205.pdfIn PDF document text
    • https://basisangka.com/contents/files/jajexotojitalomatemeza.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/38204229836.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/pigizupa.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/96091215406.pdfIn PDF document text
    • https://parfumzone.ro/files/file/sefediwezimimefolo.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/bositopegijiz.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/21561890716.pdfIn PDF document text
    • http://yilip.net/userData/board/file/9765528041.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/xupixobinuwufo.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/pazopifage.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/liramuvukulup.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://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_off0000d8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DD 10560 bytes
SHA-256: f56db46065a1e7892efbdc94b4594bfd3e3bddd80e0d7114317917deb5a9143e
font_02_sfnt_off00010923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10923 18364 bytes
SHA-256: 811c9ac58c6035bbba0608cc89dc04c0adb89139779c4a7a567486275a490482

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