Malicious PDF — malware analysis report

Static analysis result for SHA-256 1755eb59472cf1b3…

MALICIOUS

PDF

72.0 KB Created: 2021-03-20 11:47:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 2bfde1160865e10301c7f1f547b4ab71 SHA-1: fbac6732eef4ca6f4b9a03df16f2b889858dbe2e SHA-256: 1755eb59472cf1b31ff62d908249bd363e1c0f13281fa8f102207d3cd7592166
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a link farm on disposable hosting, reinforcing the malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://zajinet.ru/award?keyword=libro+automatismos+industriales+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445106/normal_6026e899424ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474448/normal_5fe705a0cfd91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367302/normal_60049992afdf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417226/normal_600ba442d5fe5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503787/normal_602f1e51697e7.pdfIn PDF document text
    • http://tawesukosipot.22web.org/iptv_smarters_pro_apk_no_ads.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424347/normal_5feaec824d6df.pdfIn PDF document text
    • http://jisurokaz.22web.org/aquaculture_book_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452400/normal_60530dde20598.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490251/normal_5fc9ddfa2d4db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371788/normal_5fdbe41bb58a6.pdfIn PDF document text
    • http://vumutita.22web.org/concerning_the_spiritual_in_art.pdfIn PDF document text
    • http://rugegav.mywebcommunity.org/53396624340.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401983/normal_60066c8f826dc.pdfIn PDF document text
    • http://gijofabenetawix.66ghz.com/846108331.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503035/normal_603c13a0590b5.pdfIn PDF document text
    • http://xisumagogali.getenjoyment.net/79659009771.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419849/normal_60445b30f2f94.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pujasozitibuzi.epizy.com/pixovagidapekanejoves.pdfIn PDF document text
    • http://goguvero.epizy.com/call_of_duty_mobile_mod_android_1.pdfIn PDF document text
    • http://sorisavitekinuj.onlinewebshop.net/kimatomurezizas.pdfIn PDF document text
    • http://wixobopi.rf.gd/rinasesodog.pdfIn PDF document text
    • http://davutawopoban.epizy.com/sivilutajemedatubekami.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD31 5268 bytes
SHA-256: 363c978ca3ed7ae497bf879a680c919b14fbf1a5bfe2c8159b85c58e7919f3c5
font_01_sfnt_off0000eefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFE 10832 bytes
SHA-256: 5c9a7ed18b14b8d0bf05fd970eeb0f166505016056f2e5a8a040b85dc8c77974

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