Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ecf57f848a6e1ba…

MALICIOUS

PDF

85.9 KB Created: 2021-03-17 03:16:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 37f1e2fc5005e4c368a9f738b8f40d43 SHA-1: 6cadfde48b9e422e05458f8e7f78ad9946003644 SHA-256: 6ecf57f848a6e1ba658bb794b3fd81103f8b8eaef20f8998b28a87780a9c11f4
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content. The document body, though heavily obfuscated, contains keywords related to downloading a PDF, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://resalured.ru/award?keyword=tax+amnesty+scheme+2020+pdf+download PDF link annotation
    • http://dodovekamorodas.22web.org/warranty_deed_arizona.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368496/normal_602f0e062bec5.pdfIn PDF document text
    • https://jumugegapu.weebly.com/uploads/1/3/0/8/130814907/cbafae56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391335/normal_60064bd4eb531.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384836/normal_6022dc012873a.pdfIn PDF document text
    • https://jepifobowokeba.weebly.com/uploads/1/3/0/7/130776363/2118a28b28f.pdfIn PDF document text
    • https://gozawufi.weebly.com/uploads/1/3/1/3/131398332/56077912c4f62.pdfIn PDF document text
    • http://defumemijiwof.22web.org/simeg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476939/normal_60066d99444da.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
    • http://zolewari.rf.gd/72816583753.pdfIn PDF document text
    • http://gavigepovu.epizy.com/5979365002.pdfIn PDF document text
    • http://tojugejuxutusur.epizy.com/how_long_does_it_take_to_charge_onn_bluetooth_headphones.pdfIn PDF document text
    • https://734e8db3-b9db-457c-abaa-08c06218e7ae.filesusr.com/ugd/f6bb82_e45d7c8171d8447db1a575c05bcc9b69.pdf?index=trueIn PDF document text
    • http://nanesipub.rf.gd/22277030482.pdfIn PDF document text
    • http://gefutikavuza.epizy.com/vixulid.pdfIn PDF document text
    • http://dilezupuforew.epizy.com/tezudel.pdfIn PDF document text
    • http://puviseb.epizy.com/53833165497.pdfIn PDF document text
    • http://rolozaj.epizy.com/46197823836.pdfIn PDF document text
    • http://nirawedadesax.rf.gd/apple_airport_express_setup_android.pdfIn PDF document text
    • https://f4a80ce2-0a24-44e2-aff7-13c87a434ee9.filesusr.com/ugd/ace063_d438b51bb33e40f6bd6e222b311c6ada.pdf?index=trueIn PDF document text
    • http://mejovusemuvov.rf.gd/ropemiwinogadozusiru.pdfIn PDF document text
    • http://mewexam.epizy.com/zavor.pdfIn PDF document text
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_e59b3d6ed743480d8842f909a0dd6732.pdf?index=trueIn PDF document text
    • http://buwojilow.rf.gd/ionic_covalent_bonding_worksheet.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
    • 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_off0000e82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82D 5524 bytes
SHA-256: 88d589047dcd4c061005c0a5a5167a6255eb8ffd1ffa111c51f6e50a8cfb9eeb
font_01_sfnt_off0000faec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEC 12140 bytes
SHA-256: 4dba5ea0ee05a0be390aafeeb89e6d8b93d3ec93a796fb1aca45c62d0edff1f2
font_02_sfnt_off0001245d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245D 16216 bytes
SHA-256: 2018bf945026639897a20fd429b4efdff6abc76811f542ed6a79ac4a5d2113ea
font_03_sfnt_off000139c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C0 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71