Malicious PDF — malware analysis report

Static analysis result for SHA-256 d681bee9af0b32ed…

MALICIOUS

PDF

80.2 KB Created: 2021-02-11 02:54:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 93baa0915fe4af121970a9773a510546 SHA-1: fd1d204e559b873957768e969318ed79cf61017b SHA-256: d681bee9af0b32edc94005ac36f051d6fd593709761d9e46969d32dc0823a3c5
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting an attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using link farms on disposable hosting, further supporting a phishing or malware distribution motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wb?keyword=dairyland%20power%20cooperative%20annual%20report PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410194/normal_600d2f96e10da.pdfIn PDF document text
    • http://prod-fruit.space/spaceflight_simulator_1._51_mod_apkr965d.pdfIn PDF document text
    • http://tublitalia.space/no_man_s_sky_xbox_one_wikiikwo1.pdfIn PDF document text
    • http://dimax-matrasy.ru/suxitorenigetojapanimump7ju3.pdfIn PDF document text
    • http://all-system7.work/nopudoqdz4s.pdfIn PDF document text
    • http://newyearshop.site/fikavotisa54zc3.pdfIn PDF document text
    • http://edarudost.online/mumokidikudefitenutqlu.pdfIn PDF document text
    • http://trickyturkey.com/goddess_toning_program_free_download2533f.pdfIn PDF document text
    • http://pasetbs.xyz/used_motorcycles_for_sale_by_owner_near_meum6un.pdfIn PDF document text
    • http://mosdendy.store/35788330879stis1.pdfIn PDF document text
    • http://xruhdfo.site/journal_entry_template_excel_for_expensest1sfo.pdfIn PDF document text
    • http://sandwichhq.club/kexofuparetusid5db55.pdfIn PDF document text
    • http://igonlinesupport.com/stick_fight_unblocked_weeblyyjdtw.pdfIn PDF document text
    • http://gbo.guru/seborowivegusepipev6r47.pdfIn PDF document text
    • http://pycnidwzxc.info/fenuxutotegonabutimbxa5.pdfIn PDF document text
    • http://probmaka.tech/elements_of_poetry_alliteration_definitionfstt5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/check-_list_para_el_diagnstico_empresarial.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/bibuvabigilanef.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000104fc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x104FC 26472 bytes
SHA-256: dc8432e7e10331872b1ed11f97e40a95241a2d5d1b0b984c144a89451073586c
font_00_sfnt_off0000cf7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7C 5140 bytes
SHA-256: 1864ea436ad8092abf3c77376781a6048b33083f1c5eb7d5b9a089b1e6019b80
font_01_sfnt_off0000e12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12D 10516 bytes
SHA-256: 0a4dbbafc181d9164c7429d26721bb1373653b69ccddf587cc99b4b3d92e1517

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