Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c739316dfd416a…

MALICIOUS

PDF

85.9 KB Created: 2021-03-24 09:13:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c25a53903448b93c1c72d03f26d2b751 SHA-1: 2dcd9c4bbb03e143b7c20fdbf5385e9f31c4e590 SHA-256: d8c739316dfd416ac85c563ec65038728c4e1cef44a6c85c0cb80cab3c3a4565
146 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, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on potentially untrusted domains, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://golowaki.ru/123?utm_term=my+airtel+thanks+app+apkpure PDF link annotation
    • http://ketaton.mywebcommunity.org/parrot_minikit_neo_user_manual.pdfIn PDF document text
    • http://dommasters.site/98021048197keu94.pdfIn PDF document text
    • http://kelimap.mywebcommunity.org/what_are_some_personal_aspirations.pdfIn PDF document text
    • http://lajodibibodi.getenjoyment.net/80882820896.pdfIn PDF document text
    • http://prodive.su/kick_the_buddy_hack_mod_game59q1o.pdfIn PDF document text
    • http://twirlini.com/tattoo_flash_books_for_salectnnv.pdfIn PDF document text
    • https://cdn.sqhk.co/lipisedopila/amhcTBu/gidinifeja.pdfIn PDF document text
    • https://cdn.sqhk.co/lexikegije/gjuZIif/shooting_games_pc_unblocked.pdfIn PDF document text
    • http://botefin.medianewsonline.com/ekt_computer_science_book_free_download.pdfIn PDF document text
    • http://wifunagidoli.mypressonline.com/ruxixaguwadex.pdfIn PDF document text
    • http://zarudofafibitov.mywebcommunity.org/xolekewarefuvodulenaganiv.pdfIn PDF document text
    • http://uscarins.info/vampire_diaries_damon_death_scenega9vx.pdfIn PDF document text
    • http://vonoxafaku.scienceontheweb.net/17901005649.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://af8e4364-7f8a-45ec-af3e-d69da1c27fbb.filesusr.com/ugd/12c36c_c25aafe932014b08a5bf2aa5008aec9a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tokit/41390916701.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/troy_bilt_pressure_washer_2800_psi_2.3_gpm_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/basic_subject_verb_agreement_rules.pdfIn PDF document text
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_5aa806c499314786b23bcd744ef5c366.pdf?index=trueIn PDF document text
    • http://vekamodadon.onlinewebshop.net/accounts_payable_interview_questions_and_answers_in.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/grade_6_math_worksheets_ncert.pdfIn PDF document text
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_c05da692417745e6b24c1e28c1238a48.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88D 5080 bytes
SHA-256: 27a57e43da97d86df2d1f121c23585b16fb07895f3a59193d8b453b2e38a5be6
font_01_sfnt_off0000f9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D5 5092 bytes
SHA-256: 0f7bd4b15930088c59d4abb629c8743a63c9fa7d9c2545f00388d2a9af3c7f5d
font_02_sfnt_off00010cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAB 11288 bytes
SHA-256: 9bd72cfa9db89c7481a9332b2aa6c2bc1ea07a95b0368450d082d5e71664aa69
font_03_sfnt_off0001334a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334A 16116 bytes
SHA-256: 5ec139a263af45d7cbac1bc1a000173eb4e7f97797aba0f35ce2e37505b4886e

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