Malicious PDF — malware analysis report

Static analysis result for SHA-256 e18a13327f2f5564…

MALICIOUS

PDF

76.4 KB Created: 2021-04-07 21:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a9984d6296772e7f791ab1fcd31b2076 SHA-1: 2a664ed132a422d8f918979d192d23b39d2fa019 SHA-256: e18a13327f2f5564bd6c59c4b62dbc66a419097bdf6bb64e6b62758ce56923a5
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms used to distribute malicious content or conduct phishing. The 'DOC BODY' content, though heavily obfuscated, includes a title suggesting a manual, which is likely a lure. The presence of multiple external URIs and a high ML classifier score indicate malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=quietside+mini+split+owners+manual PDF link annotation
    • http://gejokakop.mygamesonline.org/you_never_eat_alone_the_series_eng_sub_ep_1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380876/normal_5fe4f779b51a5.pdfIn PDF document text
    • http://xifadezuzurap.medianewsonline.com/45804847783.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450428/normal_606ce163c91e5.pdfIn PDF document text
    • https://bazulerijodinib.weebly.com/uploads/1/3/1/8/131856415/suzekavepox-pixegurapozaz.pdfIn PDF document text
    • https://gesurori.weebly.com/uploads/1/3/4/3/134353915/gegexol.pdfIn PDF document text
    • http://bumumapa.mypressonline.com/brinkley_apush_textbook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469116/normal_6033a16ecdd6f.pdfIn PDF document text
    • http://vajukadezazi.getenjoyment.net/64396013081.pdfIn PDF document text
    • http://fiwisud.getenjoyment.net/ge_universal_remote_codes_for_vizio_tv_cl4.pdfIn PDF document text
    • https://xamorodedas.weebly.com/uploads/1/3/4/7/134714841/donosov_sevenuv_gevibawejizedet.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
    • https://uploads.strikinglycdn.com/files/f941b931-953a-4431-8962-ba368aba279b/what_is_mean_by_household_income.pdfIn PDF document text
    • http://viwudajokufado.atwebpages.com/lactobacillus_bulgaricus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0869cba1-b44b-4c61-96a8-511cc03a9174/find_fghx_calculator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7e839a7-94e2-49c0-9a44-31b79dea5f1a/jararewaditejesalukuvutek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5af7373-eccf-4b53-963c-be39c6fa8713/stone_soup_cafe_walla_walla_menu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79c08566-dfca-4ea7-851c-535f5f2bff80/52792867299.pdfIn PDF document text
    • https://665985ba-8e9f-4173-b993-17a3090d61d7.filesusr.com/ugd/08421c_f21cc87dd6e0456fbe4cc352569675aa.pdf?index=trueIn PDF document text
    • https://c78ffd2e-fc3d-4272-86ca-968d835fb7ad.filesusr.com/ugd/0f9ef0_78e81df7495a403e9823559f1faf15d6.pdf?index=trueIn 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_off0000e201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE201 5140 bytes
SHA-256: 8c854a05166d75f738b6b87451ad9b71678b7c456434af19bb23103e6440743b
font_01_sfnt_off0000f36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36A 10292 bytes
SHA-256: b47b5fdfcda2d2f770fd4d62c7bb28df8eec06d0ee3ab2513d2abc5c2a466362
font_02_sfnt_off0001167b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167B 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333