Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9af3c9fbcc9fd3e…

MALICIOUS

PDF

80.9 KB Created: 2021-03-19 19:05:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 18f0349afa6c32f1c92abb4f0b6cc47d SHA-1: 7264b07039884a0b02954f4678d622915422ca70 SHA-256: b9af3c9fbcc9fd3e618fcc29836d31ae16150d3e652eff01d21078e0be4d9824
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to a link farm designed to redirect users, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to 'Afda mean median mode range practice worksheet answers', aiming to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 5

  • 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 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://baarspo.ru/strik?utm_term=afda+mean+median+mode+range+practice+worksheet+answers PDF link annotation
    • https://kegorobaz.weebly.com/uploads/1/3/5/9/135963119/4645238.pdfIn PDF document text
    • http://xukosususif.medianewsonline.com/how_to_change_ipod_name_without_itunes.pdfIn PDF document text
    • http://dofujifeluradep.medianewsonline.com/761279639.pdfIn PDF document text
    • http://fujigukatujewu.medianewsonline.com/parinuxabaxowi.pdfIn PDF document text
    • https://dozetiwe.weebly.com/uploads/1/3/1/8/131856451/bonulewoxujufade.pdfIn PDF document text
    • http://topifurolezup.iblogger.org/lodovogisulebugexux.pdfIn PDF document text
    • http://favodokoleti.mypressonline.com/tax_file_application_form.pdfIn PDF document text
    • http://kapovulup.mywebcommunity.org/dokiwolevatuk.pdfIn PDF document text
    • https://walikuroxora.weebly.com/uploads/1/3/2/8/132815001/zefaboriwodi.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/9e2ec8e4-d6d8-4a1a-8faa-c969eb08b20b/dlink_dsl-2750u_v1_firmware_update_hardware_v1.pdfIn PDF document text
    • http://mapureju.epizy.com/bhikari_bal_jagabandhu_pari.pdfIn PDF document text
    • http://kedisijusa.onlinewebshop.net/tokozifegiw.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/74355038338.pdfIn PDF document text
    • http://nobugurunujut.epizy.com/how_to_tow_with_a_jeep_grand_cherokee.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/32533049927.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d07c794-fbb8-434a-b9e1-9de4f31d8bde/the_neverending_story_castle.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/metformin_glibenclamide_combination_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a20e0107-0f15-4ee8-801d-8e839f754bf3/87256031930.pdfIn PDF document text
    • http://fuvamawijivef.atwebpages.com/kopipatuvit.pdfIn PDF document text
    • http://ruwoliwipuzil.rf.gd/how_to_unlock_door_of_whirlpool_duet_washer.pdfIn PDF document text
    • http://wolobugoxew.myartsonline.com/fopatinugudog.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/xudaduvemodibazude.pdfIn PDF document text
    • http://xekazaz.myartsonline.com/jibamojob.pdfIn PDF document text
    • http://dilutibu.onlinewebshop.net/a_feast_for_crows_audiobookslab.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/zogivosu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1a4b281-5771-439e-a402-a750f0d01e54/monitorear_red_lan_gratis.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DA 5472 bytes
SHA-256: 77318eecf1884049249c242976963a20ca1d79d081d6bfe735548b5db04f0d97
font_01_sfnt_off00010559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10559 9860 bytes
SHA-256: aac6196c811b1d05f7eb963ccf8c2c87d6011964619b1229a25af5f485fc2f70
font_02_sfnt_off000126d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D8 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e