Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8aec0db07639eb…

MALICIOUS

PDF

76.7 KB Created: 2021-04-19 19:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 7b0c74d73481150c1a1b04886123b7ca SHA-1: b5b450a5fe56bd07c0eac9a0876fb091795e73a9 SHA-256: dd8aec0db07639ebae4ef4a4300abcda86ed88a1c72c497af0ccea7f3ca199d1
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing or a trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs are designed to redirect users to potentially malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/strik?utm_term=mini+speaker+bluetooth+instructions PDF link annotation
    • http://tryici.xyz/53701711652i80nw.pdfIn PDF document text
    • http://nudistoff.club/around_the_world_in_80_days_chapter_1-5_summaryru3vd.pdfIn PDF document text
    • http://kellys.space/25215333306l7pfq.pdfIn PDF document text
    • http://idealicaitaly-ufficiale.site/19819020842trm76.pdfIn PDF document text
    • http://reawont.online/modern_dead_release_datetqjj8.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/60f27d99-be13-4cb5-8c62-dfe87146dd2f/what_is_the_summary_of_second_class_citizen.pdfIn PDF document text
    • https://e1cd7dcf-8988-4be8-9b1a-722367337987.filesusr.com/ugd/6203b9_53e1eba7c15d4e949a8fa9f8c432cd9a.pdf?index=trueIn PDF document text
    • https://ad9f1622-e3b7-49db-bfef-326c48fb2104.filesusr.com/ugd/a467d2_b5887d409c5244ee88f14abdcb5d4cc6.pdf?index=trueIn PDF document text
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_f4869e4027be4366b14d35e4af096d07.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/catahoula_cur_dog_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b87190aa-cabc-4868-bbfc-6a5cff5ce13b/japibosaxadumubolut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af47a0a8-180a-4401-940b-515785bbe58b/45835227744.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae420a84-25c8-4ec9-b3e0-2242816c4358/strength_training_program_for_menopause.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/creo_parametric_2._0_free_with_crack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c82ee56-42be-481f-926f-6011caf642e5/sentence_with_safety_measures.pdfIn PDF document text
    • https://3485775d-af35-4505-8fb4-f6750f575e04.filesusr.com/ugd/42f18e_c36616e66415405c84c3127bc73afd3f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/begijufadi/budget_laptop_buying_guide_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/567893f0-0ac6-4c40-a49b-22089e3d9e8d/what_does_slant_stand_for.pdfIn PDF document text
    • https://e53c8fcc-339b-4d8f-83f6-44ddc8c6ace4.filesusr.com/ugd/1ea9c4_35671f27c5bd4fbb97901a3bc0c8af46.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wurivuve/fit_for_life_gym_jacksonville_nc.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/garez.pdfIn PDF document text
    • https://9d349da1-218b-4b59-9e37-2a90cab56d40.filesusr.com/ugd/de9003_c8fb2f7c366640a5838b3370f55834b7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b972951-8137-48ae-834b-09deead92f28/tuworazegozugibibipev.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_off0000ee54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE54 5228 bytes
SHA-256: 7e9817a8d8ff7877f9296dc064568026dc76f0064dd30c26f17d5d4461b70326
font_01_sfnt_off00010025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10025 11016 bytes
SHA-256: c85611f0c20622237c74b4c08b36fd63c3ff95fe792f2dff91f1ae75b99e42d3

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