Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccaef03e4128d62a…

MALICIOUS

PDF

90.0 KB Created: 2021-04-05 06:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 082ffece2a5afb91eb0cc9aa43b0b77a SHA-1: 8017f39ed7208549e908235bfcfa74155b0f5ee9 SHA-256: ccaef03e4128d62a5b0920ddb6d338432a5057ff16e5e0c386652af114525675
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 are SEO-optimized and point to other PDF files, indicating a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/wix?keyword=euler+paths+and+circuits+worksheet+answers
    • https://sozaruterir.weebly.com/uploads/1/3/0/7/130738534/3243383.pdf
    • http://vurovolapoza.mygamesonline.org/92783721191.pdf
    • https://cdn-cms.f-static.net/uploads/4470533/normal_606639641d854.pdf
    • http://negeduji.66ghz.com/7444201713.pdf
    • https://cdn-cms.f-static.net/uploads/4387244/normal_604949fb185e3.pdf
    • https://linajijokib.weebly.com/uploads/1/3/4/0/134000065/4aa9d9f42.pdf
    • http://rexonina.medianewsonline.com/jzyk_angielski_dla_pocztkujcych_dobrzycka_kopczyski_chomikuj.pdf
    • https://cdn-cms.f-static.net/uploads/4366625/normal_604f3ecfe73fd.pdf
    • https://cdn-cms.f-static.net/uploads/4383128/normal_606363ea659b6.pdf
    • https://dipilewojariwu.weebly.com/uploads/1/3/2/8/132814651/vejopefu-levozabisu-gajifisew-maronipixajekis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lodofujur.rf.gd/recharge_card_printing_software_for_android.pdf
    • https://s3.amazonaws.com/fosagoba/govisixukawimad.pdf
    • https://s3.amazonaws.com/kosamupim/mubabiliz.pdf
    • https://s3.amazonaws.com/dosalapasenow/14328361214.pdf
    • http://bototiluwoge.atwebpages.com/walter_mitty_book.pdf
    • https://s3.amazonaws.com/gotitibekovi/accidents_reported_today_milton_ma.pdf
    • http://wexitabuvup.epizy.com/sinergismo_y_antagonismo_en_farmacologia.pdf
    • https://s3.amazonaws.com/sojebelevenex/bsc_nursing_online_form_rajasthan_2019.pdf
    • http://zasegusof.epizy.com/barcode_reader_for_android.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_off00011f2a.bin
f2b873ed5c7a2fe956bc2d57af2bd0d64b26ecfc74d46ff3b149b5ab24932446		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2A 5276 bytes
font_01_sfnt_off00013120.bin
ea41a870cc5765c413ee90bdc1482739aed38d0bdd9589b1db05956e2ba41539		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13120 12656 bytes

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