Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4034947ca4a621f…

MALICIOUS

PDF

75.1 KB Created: 2021-05-17 04:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5ec0ee7dc660e061af45eff2a97e9fea SHA-1: ed6f99d21aeb9818dd2eda717f1fcb8bdddb8464 SHA-256: b4034947ca4a621f50ed42b00fed3335d3908deda0286c042246d68fe8b6c16f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a suspicious domain ('nipisod.ru') that is likely part of a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though partially obfuscated, suggests a lure related to appliance maintenance to draw users to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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=how+to+remove+daikin+air+conditioner+cover PDF link annotation
    • http://xasedogamif.mypressonline.com/pdf_autobiography_of_mahatma_gandhi.pdfIn PDF document text
    • http://ramifapufebi.scienceontheweb.net/55162128992.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2571d5ef-7130-409a-b87d-c3fd18a83f30.filesusr.com/ugd/71fc55_1837cf646edf4e1b9b8ebf6602e8814b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/malta_smart_tourism_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/11030902877.pdfIn PDF document text
    • http://vidugozu.atwebpages.com/60196263930.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/gijuwivasuji.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/cuales_son_las_clases_de_deportes_que_existen.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/fezap.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/how_to_practise_boxing_at_home.pdfIn PDF document text
    • http://saxodanokijaj.atwebpages.com/gadixa.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/29983419592.pdfIn PDF document text
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_b230d43557514b7d9a3c88438642a7af.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/460dc970-4679-448f-9126-29dd28f29e0f/bedejuvesogafaxofagorer.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/spoken_english_activities_for_kindergarten.pdfIn PDF document text
    • https://ac614e2c-2e00-43e4-a80f-2c6bce9fb64b.filesusr.com/ugd/f103bb_d54d69540b9d474997f8aea1c1049812.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fipijife/saeco_royal_espresso_machine_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/77972292143.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/broadcom_drivers_for_ubuntu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e92a110-bb4b-4fde-985c-4a576dcdb861/how_to_do_layers_in_photoshop_elements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad574252-3b71-4e66-9723-048704ad3319/nelson_textbook_of_pediatrics_test_bank.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_off0000e77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77D 5052 bytes
SHA-256: 0ead342ef6030d6b9509df25b386e1afebfed6fef1de34ab3595dec3f5579311
font_01_sfnt_off0000f8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AA 11228 bytes
SHA-256: 336b09e51dec37d8b6ee2d7c82c2a35d991c6611e1b3c07552400f40da09b5d8

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