Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2dfd30eee19038c…

MALICIOUS

PDF

76.2 KB Created: 2021-03-04 01:05:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2a8e6868b9e558757391aea973dfe3db SHA-1: b7951c5bee9d1e60a7ccdcbefd419b1c409007b5 SHA-256: e2dfd30eee19038c16713e573d08bad06d59c7cdfd02382dd61dc7cb5a6e7e6a
124 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating redirection to known malicious infrastructure. The document body, though heavily obfuscated, suggests a lure related to chemistry, likely to trick users into clicking the malicious links. The ML classifier also strongly flagged this PDF as malicious, supporting the assessment of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=que+es+composicion+centesimal+en+quimica In PDF document text
    • https://cdn.sqhk.co/miwizawi/hiLgchD/math_tricks_with_answer.pdfIn PDF document text
    • http://ravigimojamel.mypressonline.com/wuwafobugosisoginoze.pdfIn PDF document text
    • https://cdn.sqhk.co/vugasoveg/hesjf7O/into_mirror_game.pdfIn PDF document text
    • http://vofuvomo.iblogger.org/povogotuzewejajijafuz.pdfIn PDF document text
    • http://geparup.scienceontheweb.net/6465792388.pdfIn PDF document text
    • http://lupelisizi.medianewsonline.com/81295224868.pdfIn PDF document text
    • https://cdn.sqhk.co/zesojesiwi/jjjKVhi/viwogobi.pdfIn PDF document text
    • https://cdn.sqhk.co/sirejeforox/BcPCgdu/ledomifewarijuzogof.pdfIn PDF document text
    • https://cdn.sqhk.co/fegadosijete/rM5T1ii/view_my_mcat_score.pdfIn PDF document text
    • http://buledumemo.iblogger.org/94435521794.pdfIn PDF document text
    • http://leririv.sportsontheweb.net/mibosiserapep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.thdl.org/http://www.thdl.org/TibetanIn PDF document text
    • http://kozogasivufi.myartsonline.com/womiwukujupolizemo.pdfIn PDF document text
    • http://fuvuvadut.onlinewebshop.net/evenflo_triumph_lx_car_seat_review.pdfIn PDF document text
    • http://nifilovovi.rf.gd/chambal_kannada_movie_tamilrockers.pdfIn PDF document text
    • http://wijuromosumeko.rf.gd/sisezaz.pdfIn PDF document text
    • http://tudaxagobex.rf.gd/mta_sql_server_database_fundamentals.pdfIn PDF document text
    • http://viwuwijagabote.myartsonline.com/problem_solving_exercises_for_high_school_students.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://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlTibetanIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C4 5168 bytes
SHA-256: 552e94a91ebc478f30e7b54f94ac081afa9a1a49f1a649d07210526b34c89385
font_01_sfnt_off0000e84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84D 8976 bytes
SHA-256: 7e98081f44ff9be21f2be21d17426fa35b07cfbadd26ac3f6cbb691f5ce60abc
font_02_sfnt_off0000fa11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA11 11988 bytes
SHA-256: ba5a62f487ab9b012d8265d3d5c04a6579b18d3bd59fd0821ae1738e1f6ff23f

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