Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a56e05586bc5aa2…

MALICIOUS

PDF

90.0 KB Created: 2021-03-25 00:52:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0fc4192efcd15412a28d816dc020a89 SHA-1: cc5915e5d870ab94500bef76cdf882a6eda13705 SHA-256: 7a56e05586bc5aa2e90c992b50a036e2521e88f3cf258cb78fce4ecc33284586
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan. The embedded URLs suggest an attempt to redirect users to potentially malicious sites or to host further malicious content, possibly through a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=what+is+the+best+exercise+to+tone+your+buttocks
    • http://deliwubavamir.mypressonline.com/badigazibipafowuxizo.pdf
    • http://tasigezagu.scienceontheweb.net/exercise_physiology_book_free_download.pdf
    • http://gepexoliv.medianewsonline.com/menace_d_accouchement_prmatur_thse.pdf
    • http://mobufuwiwid.medianewsonline.com/crafting_and_executing_strategy_the_quest_for_competitive_advantage_concepts_and_cases_22e.pdf
    • https://biramufon.weebly.com/uploads/1/3/4/7/134775887/raposavegoren_sijejexepubaven.pdf
    • https://gimiduti.weebly.com/uploads/1/3/4/7/134711596/susuzafezamep.pdf
    • http://rabiwitijif.medianewsonline.com/garmin_gns_430_manual.pdf
    • http://sejerodetupumil.medianewsonline.com/lanoxana.pdf
    • http://powajaxib.medianewsonline.com/conductivity_of_water_experiment.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/c9a49f64-105e-451d-b0b0-c775f1cb5141/zozekovudezoxalewugep.pdf
    • https://uploads.strikinglycdn.com/files/881217f7-68be-4404-896e-f542e13da719/48898574401.pdf
    • http://taguloxutenafol.myartsonline.com/how_do_you_rearrange_pages_in_a_file.pdf
    • http://lajovaputap.myartsonline.com/runolimubuvavil.pdf
    • https://uploads.strikinglycdn.com/files/2770691a-975a-47b1-9efd-1c79e176cbdf/how_to_start_up_wii.pdf
    • https://s3.amazonaws.com/rubidokezive/dcs_a-_4_skyhawk_manual.pdf
    • https://uploads.strikinglycdn.com/files/a30418bb-cd01-453d-8e22-a4c581dc6a5d/12060122670.pdf
    • http://zuputes.atwebpages.com/dwarf_fortress_wiki_fun.pdf
    • https://s3.amazonaws.com/dogevazapiwediw/noncontrolling_interest_accounting_balance_sheet.pdf
    • https://uploads.strikinglycdn.com/files/fbd15346-4f07-4568-b9fc-b97cbf8fb116/lugufelibunodilezelim.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011536.bin
1d1bc5ec27caf18becb3c753a68bb4878389278874049999280bb1c4a6ae275a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11536 5124 bytes
font_01_sfnt_off000126a4.bin
c9dfa814153e7bec43ad0907392119cba68dfa7cbb7f6a46b463a890491c8480		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126A4 10668 bytes
font_02_sfnt_off00014a95.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A95 4324 bytes

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