Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a113ceb262da46…

MALICIOUS

PDF

76.0 KB Created: 2021-03-29 04:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c0eaaa586a8ee6f6300b752ce4e5928a SHA-1: 3475ffcad960303db2591c71fc6bbd38227fbae6 SHA-256: 86a113ceb262da46e37d8ad21c866549d01e0553dd6fb705a69d07ba09bec4c1
246 Risk Score

Malware Insights

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

The PDF document contains a critical heuristic firing for brand-impersonation credential phishing, specifically targeting Facebook. It leverages a link farm strategy with numerous external URLs, many hosted on disposable domains, to obscure the malicious intent. The embedded URLs and the overall structure suggest an attempt to lure users into a phishing site, likely facilitated by JavaScript within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://xadadoroz.weebly.com/uploads/1/3/6/0/136024884/5b68c831.pdf.
  • 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=family+guy+quest+for+stuff+cheat+engine PDF link annotation
    • https://xadadoroz.weebly.com/uploads/1/3/6/0/136024884/5b68c831.pdfIn PDF document text
    • https://melazikadoxu.weebly.com/uploads/1/3/4/5/134594637/691497.pdfIn PDF document text
    • http://mowukedova.mypressonline.com/risobosovezisutusowejizad.pdfIn PDF document text
    • https://dumuzuvo.weebly.com/uploads/1/3/4/6/134695275/wazozi.pdfIn PDF document text
    • http://vosajizegek.mypressonline.com/niriwigidizumeda.pdfIn PDF document text
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/e20a0860b.pdfIn PDF document text
    • http://gikepofazanapol.mypressonline.com/rususesaz.pdfIn PDF document text
    • https://tolawururajetam.weebly.com/uploads/1/3/4/8/134883146/togupireridiwamodu.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/49cc7a9c-2ba5-449b-a2bc-27dee088a1b6/juvibopikibogap.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/cuisinart_burr_grind__brew_dgb-700bc_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a8cc7e7-9ee5-4106-a972-113dea07867a/dinafivoxitujuzibajob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7fdbe85-c98a-4bf5-85eb-f2cad2e9070a/68118130465.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1386d995-4769-41ab-b3e0-289e730a7bf5/zone_of_proximal_development_and_scaffolding_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/sda_church_manual_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2aca9967-1e12-4cb9-9058-d3fdf6748f69/befalisalewin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3291d075-a27c-49ba-8500-5198041b533c/38804220584.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/vezuvebatezovilolonikugi.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/blackpink_ice_cream_song_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abe82e19-6ca7-4909-aeb7-33e54362ee9e/what_is_the_instrument_used_for_measuring_pressure.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/sciatic_nerve_exercise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7892a279-e88a-455f-8c56-198752e5536f/75614572019.pdfIn PDF document text
    • http://kugajevekafino.myartsonline.com/business_english_communication_course.pdfIn PDF document text
    • https://s3.amazonaws.com/wumodukubaru/takolojufafew.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/net_interview_questions_and_answers_for_experienced.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_off0000ea3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3E 5476 bytes
SHA-256: b3b9874f4a2a6bb81744d4c1d817fc33d1e3626f8f251453a5886f36421cbf37
font_01_sfnt_off0000fcc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC5 10940 bytes
SHA-256: 411d0a1562c4c62acac2a9abb7f45cbb2c7588154d4c1ba1c3802812ee7bb0f2