Malicious PDF — malware analysis report

Static analysis result for SHA-256 8479159ab5563f9c…

MALICIOUS

PDF

73.7 KB Created: 2021-04-14 07:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 58d0d29aab5141df2c4a35ad9e4e51a7 SHA-1: d561df1e9190cb9519cdeb944f771087910cd6d6 SHA-256: 8479159ab5563f9ccb9b03a3003282d3a7a471ec60b1bc8c934afee4ab3b5d2f
126 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, many of which point to disposable domains and are part of a link farm, indicating a strong intent to redirect users to potentially harmful sites. The presence of external URIs and the ML_NYX_PDF_MALICIOUS heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/strik?utm_term=what+food+do+you+eat+on+noom+diet PDF link annotation
    • http://islemleriniz.org/28529252141x4wdz.pdfIn PDF document text
    • http://pagebake.com/daraterubemak3c.pdfIn PDF document text
    • http://xidasetetobuge.scienceontheweb.net/peditoxaza.pdfIn PDF document text
    • http://tibijosetinaj.getenjoyment.net/the_motivated_student_unlocking_the_enthusiasm_for_learning.pdfIn PDF document text
    • http://dabukim.mygamesonline.org/how_can_i_track_my_girlfriends_phone_location.pdfIn PDF document text
    • http://hugertely.xyz/jotosurg6z1z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499660/normal_602f3f2173def.pdfIn PDF document text
    • http://2220202.ru/reaccion_de_combustion_incompleta_del_propanoda55r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476015/normal_604901aa6d5d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459914/normal_605efa2bd2530.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478137/normal_600a221642507.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501509/normal_5fff244ea34e1.pdfIn PDF document text
    • http://masajsalonunuz.com/83070685655cansy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuwukazisopof.rf.gd/afternotes_on_numerical_analysis.pdfIn PDF document text
    • http://pozajuw.atwebpages.com/54214845981.pdfIn PDF document text
    • http://jojomuge.epizy.com/rigij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9547c7f8-af7b-4d9c-bd5b-8a2260595266/rubilal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5332c17-a0af-425e-ad86-f87a015c6f41/birch_log_table_legs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a710b1c-85c5-4df8-9ba1-f30df934f12a/besitekaporifegewabam.pdfIn PDF document text
    • http://suvofaga.rf.gd/cause_and_effect_of_earthquake.pdfIn PDF document text
    • http://kunonepu.rf.gd/kawobodafazazakeruv.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_off0000e66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66F 4956 bytes
SHA-256: 4f4ca9bd4c890c0041d4ee7f6b21eb659d5f26522e017cc2a173baf35c0466d7
font_01_sfnt_off0000f740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF740 10048 bytes
SHA-256: 5a541748d6f8e729f158e81753119df193540eb4b89cdbcc10e8dd1673610eea

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