Malicious PDF — malware analysis report

Static analysis result for SHA-256 75aa2287e13825d5…

MALICIOUS

PDF

75.4 KB Created: 2021-03-28 19:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: caa815ee952ff4ae0998a516b3e44dca SHA-1: 791bcc2ef6a320f8cab9ab03464bd0cc4cb17301 SHA-256: 75aa2287e13825d541394488c00381a6b7d925b24303cfa97272019266d263d2
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 designed to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the structure of the PDF point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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 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://vilenefex.ru/wix?keyword=bellingham+fire+department+jobs PDF link annotation
    • https://xenolato.weebly.com/uploads/1/3/4/8/134868471/zinago.pdfIn PDF document text
    • https://bixaguvukimub.weebly.com/uploads/1/3/1/8/131872105/7372801.pdfIn PDF document text
    • http://stixlife.info/season_6_grey_s_anatomy_episode_guidev93pt.pdfIn PDF document text
    • https://natagudere.weebly.com/uploads/1/3/4/5/134526504/e79528.pdfIn PDF document text
    • http://rubka.space/calendar_template_2019_october_and_novemberekscd.pdfIn PDF document text
    • http://todawis.22web.org/husky_gas_pressure_washer_2200_psi.pdfIn PDF document text
    • http://lisolu.org/leigh_d4_dovetail_jig_parts5raee.pdfIn PDF document text
    • https://bewanabexujafo.weebly.com/uploads/1/3/6/0/136050633/dasekixenobamabej.pdfIn PDF document text
    • https://juzoliposiwe.weebly.com/uploads/1/3/4/3/134322138/9087949.pdfIn PDF document text
    • http://dfahsdfgjsfg.online/ninuviwutufufiwuziwebumpico.pdfIn PDF document text
    • http://copyrightnotice-ig.com/backbench_student_songs0xthe.pdfIn PDF document text
    • http://rolevuses.iblogger.org/accounting_coach_debits_and_credits.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dijazulebok.epizy.com/carry_on_suitcase_dimensions_united.pdfIn PDF document text
    • http://barirenuvekesup.epizy.com/banafe.pdfIn PDF document text
    • http://ruvedinaz.rf.gd/konixanonimizakarizoxanev.pdfIn PDF document text
    • http://kiwutixukunow.epizy.com/iperaldosteronismo_secondario.pdfIn PDF document text
    • http://fuzaguta.rf.gd/81660415555.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_off0000e798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE798 5720 bytes
SHA-256: 9355f64f1782660e85600656c52d12cc46c99d61395da084acac807c585b08f8
font_01_sfnt_off0000fae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE5 10612 bytes
SHA-256: 458a35e99735d6be0d28ea4b8537d5cf26d1df69888a9b58ca539221f0ece712

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