Malicious PDF — malware analysis report

Static analysis result for SHA-256 028c4af4581534d0…

MALICIOUS

PDF

82.3 KB Created: 2021-09-23 03:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 44ffd74a845529d1417da0cdb6819280 SHA-1: 54735129d1e07df26c90469df9ae64888d2f3ae8 SHA-256: 028c4af4581534d0921b7264e827b2f5d9fec9a80c40077f388c753e29c662a3
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers flagged it as malicious. The heuristic 'SE_CALLBACK_LURE' indicates the document's content is designed to trick users into calling a phone number, a common tactic in callback phishing and tech-support scams. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it may leverage PDF-specific JavaScript for malicious actions, such as redirecting to phishing sites or initiating unwanted actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://studiotecnicoarduini.eu/userfiles/files/mugisafobetenokiso.pdf In PDF document text
    • https://hoavily.com/uploads/files/lomotipebubijepefilafesi.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/72159442781.pdfIn PDF document text
    • http://happy-land.hu/editor_up/68306327874.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/29462372702.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/81141501463.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/nigebigi.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210921082225.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/xakokepido.pdfIn PDF document text
    • https://beaszemin.com/files/25160643717.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/28957844223.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/dipijidon.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/geradudixabajaleros.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///novoroduxojinaxerudakosad.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/sulumogumikuduvuvo.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/lusorumuxobobalogiseb.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/88331264392.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/864693995.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/kegidemovapejesax.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/6477986112.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/wagujomofa.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/taxovopix.pdfIn PDF document text
    • https://allianztc.ro/files/file/mimezidelasigu.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/ralel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=bluetooth+server+socket+example+androidPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF278 18112 bytes
SHA-256: a52bf2f0a89008b45136ca577c76f87f4b08f16f15b02ea6b5d2536e728005fc
font_02_sfnt_off00012120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12120 11192 bytes
SHA-256: d9b8e4abd7d56efcad820a419426c63d8d20b7e2e238020fbd27e4852ce7cfb7