Malicious PDF — malware analysis report

Static analysis result for SHA-256 b23db5e2f95f1619…

MALICIOUS

PDF

80.0 KB Created: 2021-05-18 05:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: fefac7da21e4288fbc87d40f56026e73 SHA-1: 2bd2e2482583de8035d9cc5e768c1fdf768c59d9 SHA-256: b23db5e2f95f16190502bc52c451094399592296c6aa699972b623a7902ad296
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, with a significant portion hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the primary URLs extracted is https://nipisod.ru/strik?utm_term=how+to+set+up+orbit+sprinkler+timer, which appears to be a lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/strik?utm_term=how+to+set+up+orbit+sprinkler+timer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414678/normal_5fe90f445ce22.pdfIn PDF document text
    • https://ruwixotuso.weebly.com/uploads/1/3/4/1/134131383/fa78868374728.pdfIn PDF document text
    • https://saboruxeketeg.weebly.com/uploads/1/3/4/8/134850947/gixoduwavi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377928/normal_60550a32bc05d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383446/normal_605d8e1cd66e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380854/normal_5ff2bfe003118.pdfIn PDF document text
    • https://webolubodu.weebly.com/uploads/1/3/0/9/130969971/4494836.pdfIn PDF document text
    • https://julegorapatafoj.weebly.com/uploads/1/3/4/0/134016802/747727ed90142.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366408/normal_60540b243c283.pdfIn PDF document text
    • https://pedexanagokol.weebly.com/uploads/1/3/4/6/134635549/507656d82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458618/normal_5fd22e6c5ed0c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367622/normal_5ff04bb43b200.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480591/normal_6000136be3cca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393483/normal_601c62767e9de.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tapegazopiguw.rf.gd/fufasinimub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23ce4c7e-26c9-4928-9f3e-150c65f9143f/causative_verbs_exercises_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d862832c-b441-4c7e-bd07-0fc7b055f1c8/36342068190.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2473d05c-ead1-45e3-b915-ca4a7086d92b/how_to_make_income_statement_projections.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2432594-0970-4d25-9874-eda70923defa/where_is_the_connect_button_on_logitech_k520_keyboard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e997331b-db07-4610-87ad-455085a22275/can_i_get_hbo_max_on_apple_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f568eba3-9851-4283-871e-cbe99596d6b0/how_to_self_clean_kitchenaid_double_oven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffe51529-3eb2-481d-b787-219d11a40161/99706903638.pdfIn PDF document text
    • http://gupubagixigopi.epizy.com/finders_keepers_creations_shipping.pdfIn PDF document text
    • http://gidigeja.rf.gd/is_it_true_that_on_your_16th_birthday.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_off0000f9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C3 5012 bytes
SHA-256: 16f27d29aca111f5d8c69105e030d92c911bfd7056fa0c1f4176f765e9a5a89a
font_01_sfnt_off00010ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC9 11344 bytes
SHA-256: 6d3e4f6724d0203f507e0d59fc3e8094a78c5930226c60fa636e4f7c631a343f

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