Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c315fb9c0e6de4…

MALICIOUS

PDF

68.2 KB Created: 2021-03-20 14:39:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a0dce8d62dac28906e6a760858054673 SHA-1: a6bccc7b7f147b8765533cbcf2dd96cc3938822e SHA-256: d8c315fb9c0e6de4a6071ed18c6980b44ad947cf82cb69041119f7317c2185e1
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to educational materials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://pelibifir.ru/wix?keyword=chemistry+unit+1+review+worksheet+answers PDF link annotation
    • http://mamuzomilap.iblogger.org/tovizofigotezup.pdfIn PDF document text
    • http://nanukokopetip.iblogger.org/the_disaster_artist_trailer_song.pdfIn PDF document text
    • http://difavusimope.iblogger.org/31650935213.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vugovule.epizy.com/94335949981.pdfIn PDF document text
    • http://levowemorunob.epizy.com/cartola_fc_pro_apk_2018.pdfIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_16bfc24cbb7b4befb9b48d27b6d21cbf.pdf?index=trueIn PDF document text
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_eef50fa2fdb747fb8fb290515269bbc0.pdf?index=trueIn PDF document text
    • https://9e7b01ce-91ce-414a-93c5-ade8df4b7359.filesusr.com/ugd/cfbfd2_aa88ac109fd645e4b0043cfa2b69b5a7.pdf?index=trueIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_4b99f9c14b584c409121f8fe58de6f45.pdf?index=trueIn PDF document text
    • https://c63359c4-faa5-40af-ad11-254ddd3d100c.filesusr.com/ugd/838c33_4b55e7a3f3974dcca4b7cfacacff0ff7.pdf?index=trueIn PDF document text
    • https://c83cbd6e-a134-4b49-ba12-49f24c654ad9.filesusr.com/ugd/904a8b_74b5aaa8dfa341e09e4a2da7b152c6ed.pdf?index=trueIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_76df4d64895144da8445e23dfcaa5cd5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kudowo/how_to_use_a_brinkmann_sportsman_smoker.pdfIn PDF document text
    • http://torunej.epizy.com/is_there_a_filter_on_the_whirlpool_cabrio_washer.pdfIn PDF document text
    • https://62abf401-5fc9-4991-ac00-cb6a0c8cf8ec.filesusr.com/ugd/e4ff69_23a9c7e30ce94712ba6b1c0f6f3d48b3.pdf?index=trueIn PDF document text
    • https://c3e780e1-a1ee-422e-80b3-2bf79490ff1e.filesusr.com/ugd/dc7b26_37b3a63170224a6aa449ffd50bbc88ca.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/create_auto_reply_template_outlook_2010.pdfIn PDF document text
    • http://lamiredej.epizy.com/fetawanuwadutat.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/chamatkar_movie_video_song_free.pdfIn PDF document text
    • http://dinaxeziva.rf.gd/advanced_computational_mathematics_notes.pdfIn PDF document text
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_7dc67ed9ff97401b9ed4f47af8467af8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/backbone_js_interview_questions_and_answers.pdfIn PDF document text
    • http://nuwumunis.epizy.com/snake_game_for_android.pdfIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_59d0f3017e694d8ca8706f3a537a520d.pdf?index=trueIn 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_off0000d04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04D 5168 bytes
SHA-256: 1cb2d3a526728bb2d17648ba72180f19d71ef91802431d125e2304468e703182
font_01_sfnt_off0000e1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CC 9756 bytes
SHA-256: 4d092450ff2539ba3791f00f8f8fb96373956b02ea5a0cfba9c8842507aec486

Open this report in the interactive analyzer, or submit your own file for analysis.