Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1fb85561f7dc81f…

MALICIOUS

PDF

91.7 KB Created: 2021-05-03 17:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 4f532e5507284ea6a62edc5ee63670d3 SHA-1: 00a1a1af7a5ef5fa65ee58318c7412d240bf2844 SHA-256: c1fb85561f7dc81fffaed72798801e98d6c40de10aa94adb996516e3018511bc
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs, with a primary focus on redirecting to a URL that appears to be a lure for 'Hdhomerun prime setup'. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm strategy, likely to obscure the true malicious destination. No scripts were extracted, but the presence of external URIs and the nature of the heuristics point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://nipisod.ru/strik?utm_term=hdhomerun+prime+setup PDF link annotation
    • http://salonvarna.com/what_causes_earths_magnetic_fieldnvfp2.pdfIn PDF document text
    • http://waverufusufafuv.scienceontheweb.net/economic_zoology_book_download.pdfIn PDF document text
    • http://freshmind.net/697542354074cmas.pdfIn PDF document text
    • http://sunakijabe.sportsontheweb.net/razofimusoguf.pdfIn PDF document text
    • https://cdn.sqhk.co/dimowitop/gishePa/texaserinifonutopagusewu.pdfIn PDF document text
    • https://cdn.sqhk.co/pasivuzuke/ijb1wxW/civil_war_photography_for_sale.pdfIn PDF document text
    • http://texifudosino.mygamesonline.org/presentation_templates.pdfIn PDF document text
    • http://gazupoz.sportsontheweb.net/96045094427.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://cdn.sqhk.co/lilodipu/f1wz7jW/papidenugofelapize.pdfIn PDF document text
    • http://mosdendy.store/sue_bryce6db5s.pdfIn PDF document text
    • http://laribij.scienceontheweb.net/righteous_mind_book.pdfIn PDF document text
    • http://shoplus.info/zugazosudodamonuwafokuhefjh.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/jdjhfsU/5013136183.pdfIn PDF document text
    • http://zelopaqq.xyz/54158322019nrcqi.pdfIn PDF document text
    • http://italywom.space/69343433798bf50d.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://s3.amazonaws.com/vibuvomomuv/55514997896.pdfIn PDF document text
    • https://s3.amazonaws.com/tafogusegabomu/39341040055.pdfIn PDF document text
    • http://jisunopesaluzi.atwebpages.com/rainbow_rowell_wayward_son.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/bepelikawibejapexokobefi.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB53 6568 bytes
SHA-256: 2ba6e0c4516ae528974428ab90d2fcb845e31fc6427c3681d976df34e50bf0fe
font_01_sfnt_off0000fba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA0 4800 bytes
SHA-256: 35c5be9739da342f451ae7fbd8f17dfcc633ebee7ebfaf581261d429b7c599b8
font_02_sfnt_off00010bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB4 2328 bytes
SHA-256: 77946179dc02926fdaa4b0c60d5a6e4aad677d808a0d8369c4f3d51df39fe84d
font_03_sfnt_off00011637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11637 11192 bytes
SHA-256: f41778479975c88615f6afe754ba25264812cd1756ca6c3a8fcd0754b65c62a3
font_04_sfnt_off00013c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C92 16384 bytes
SHA-256: 8f906b75a2adf72b943f5ff736fca5eb569a167c291df379bcb5e3afe38e7b8e
font_05_sfnt_off00015287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15287 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333