Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd62583746a5a1cb…

MALICIOUS

PDF

73.8 KB Created: 2021-02-19 18:09:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7b5c7302cce208c30b97ff5c5b352ecc SHA-1: 1eb9bd359635dc67cd76839cbacd0f6843c00361 SHA-256: cd62583746a5a1cb6628ec5bd3f4c3fa2f7f1cc6455b90b9717bac2da0243458
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spamming operation. The presence of a specific driver download lure, combined with the ML classifier and ClamAV detection, indicates a malicious intent to redirect users to potentially harmful content. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/123?utm_term=hp+laserjet+m1212nf+mfp+driver+xp PDF link annotation
    • https://cdn.sqhk.co/juxerawabuf/MiiLiaR/real_flying_car_simulator_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/netimawifes/hXQfggF/international_mobile_recharge_api.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/OXiggct/niwikor.pdfIn PDF document text
    • https://cdn.sqhk.co/fakupavod/ijhighQ/4242178179.pdfIn PDF document text
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/satasarawukinis_wikazaxojexut.pdfIn PDF document text
    • https://cdn.sqhk.co/modonasuje/hjhgBie/best_smart_prepaid_promo_for_netflix.pdfIn PDF document text
    • http://mosasekoz.22web.org/35269706480.pdfIn PDF document text
    • https://pavuxutekukos.weebly.com/uploads/1/3/4/7/134704216/xaridax.pdfIn PDF document text
    • https://cdn.sqhk.co/tavaxiwugo/En0LZij/33310800955.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://gewapapis.epizy.com/independent_clause_and_dependent_clause_worksheet.pdfIn PDF document text
    • http://xigakixu.epizy.com/how_much_to_do_a_dna_test_on_a_dog.pdfIn PDF document text
    • http://jutibigata.epizy.com/vusodogote.pdfIn PDF document text
    • http://sobogasitizi.epizy.com/88219291573.pdfIn PDF document text
    • http://kejufunekopal.epizy.com/67359847515.pdfIn PDF document text
    • http://voferumupisefag.rf.gd/92760616552.pdfIn PDF document text
    • http://mafukifuwu.epizy.com/52437850273.pdfIn PDF document text
    • http://sikofus.epizy.com/alteryx_server_installation_guide.pdfIn PDF document text
    • http://fugewad.rf.gd/2312385703.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_off0000d614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD614 5216 bytes
SHA-256: 18bbeae2c283b8fd89876137ced920f457147f83da6dfedde523fa4f03663fcc
font_01_sfnt_off0000e7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BD 10488 bytes
SHA-256: 6b7a5feb20217ceb0f258f55c86daf4e5cdef630bbd1bb2d3a5eb8a3ae49d3ff
font_02_sfnt_off00010baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAF 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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