Malicious PDF — malware analysis report

Static analysis result for SHA-256 275b207025363e4b…

MALICIOUS

PDF

78.2 KB Created: 2021-03-20 00:40:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6c46c11dff6f1d6395065b430c5d580d SHA-1: 80310c0e955710afe8b9c53f7ea9b42535a778c7 SHA-256: 275b207025363e4b88e49272f923e383d6a2e75331ca37b625e6567bcd7cee43
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://resalured.ru/wix?keyword=where%2527s+waldo+the+wonder+book+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368468/normal_5fd67295bd387.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484815/normal_600f57ae961ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450354/normal_602747d27a8c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451945/normal_5fdf9b963fe98.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494893/normal_5ffba1f9513d9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7880ee1c-9859-493f-b997-2c8dbc5acd4a/why_does_polar_attract_polar.pdfIn PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_8adfd926fba649838a471ec94e554558.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/acb2fb29-9cfd-4f97-94b5-055c3dd10f9a/descriptive_writing_ideas_for_middle_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6e7a68e-6307-4922-b806-5d89da7e5b80/how_old_was_juliet_in_romeo_and_juliet_1968.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4ae0176-cd31-42ef-acc6-3a1761c60472/incantation_and_dance_analysis.pdfIn PDF document text
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_9cc3dc859bb246aab2b44ace386fa8d4.pdf?index=trueIn PDF document text
    • http://wotonopeg.epizy.com/96986855256.pdfIn PDF document text
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_667d4077792d488e995c25f9bfdc85d1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/14af8eba-cf09-47d0-a799-3241fd85520d/celestron_nexstar_6se_best_accessories.pdfIn PDF document text
    • http://tobobuximalusu.epizy.com/pilutilibigepige.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bcc26db-58ea-4d22-b366-6cc62b9fec48/river_flows_in_you-yiruma_sungha_jung_guitar_tab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8389b91-5c03-4a22-87e4-1a956eac3d4c/what_are_the_main_topics_in_ccna.pdfIn PDF document text
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_29d117ec61ae4fc98228bbdb69d5eb7c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec1a1d3e-b889-4c48-9401-e821a455c3ff/which_is_the_best_app_for_stargazing.pdfIn PDF document text
    • http://vufagozujidivu.epizy.com/fevofaxunij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aba9865-a7c2-4b36-9c4a-7584c5e5c134/words_to_stormy_weather.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78ff443e-9f04-4ac1-b2e5-93ef3deda481/data_mining_techniques_applications_and_tools_a_business_intelligence.pdfIn PDF document text
    • https://627ea4a7-3f28-4bf3-8c99-6a9da7dacf48.filesusr.com/ugd/1970e2_1603794c16f848a6b68a1e98a8d4bf7c.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF081 5356 bytes
SHA-256: c5b68dd379d9e33bd54fccc4b733e07f97e5357d64764735dca3e1168b2b3167
font_01_sfnt_off000102cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CD 11872 bytes
SHA-256: 7cbbba8795df270ffe824695fa6fb70e7d249731664754c76032f8f91c6f0f05