Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d168eeaaa5685aa…

MALICIOUS

PDF

70.4 KB Created: 2021-03-29 20:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: afc9a9092f7c02e36d61eee7ceaba82b SHA-1: b8812d05447faf66198fa0ed59491c3d9c0e95c6 SHA-256: 7d168eeaaa5685aa4828ceff734d52d7bef1ceee04323c4e97d6bab74b20bb6f
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, with at least two pointing to suspicious domains that appear to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to a technical guide.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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://jottigo.ru/strik?utm_term=navfac+p-601+microgrid+design+guide PDF link annotation
    • http://babozim.22web.org/application_letter_for_school_admission_template.pdfIn PDF document text
    • https://kirobobu.weebly.com/uploads/1/3/4/5/134593563/zuxukebokape_kitixuludatezus_visetus.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/american_college_of_rheumatology_guidelines.pdfIn PDF document text
    • http://bamupiwabibajew.mywebcommunity.org/primo_levi_if_this_is_a_man_summary.pdfIn PDF document text
    • http://bavimobuxadu.medianewsonline.com/bikiturosoluvilijinev.pdfIn PDF document text
    • http://lnstagram-helping.live/6131410933s06l.pdfIn PDF document text
    • http://rijunoje.mygamesonline.org/chinese_calligraphy_paper.pdfIn PDF document text
    • http://harmony-market.ru/347228299839t8fr.pdfIn PDF document text
    • https://wobereresexo.weebly.com/uploads/1/3/1/6/131606335/7477d436.pdfIn PDF document text
    • http://myfavoritesun.xyz/canon_mp240_p8_errorljvyp.pdfIn PDF document text
    • http://vanlit.ru/puvetajexajurnhsh.pdfIn PDF document text
    • http://differencecheats.net/puwukauzzzo.pdfIn PDF document text
    • http://jobediniberine.scienceontheweb.net/how_to_use_grater_attachment_on_cuisinart_food_processor.pdfIn PDF document text
    • http://simamopi.22web.org/jiwiburaro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_6d6139afb1a9438685c9fe036739b9b0.pdf?index=trueIn PDF document text
    • http://kinugokapa.rf.gd/accords_toltques_english.pdfIn PDF document text
    • http://xirozaza.onlinewebshop.net/la_atmsfera_y_sus_capas.pdfIn PDF document text
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_0775491367b140c492e31ae15ffadd2b.pdf?index=trueIn PDF document text
    • http://jaxunukologefis.onlinewebshop.net/69520941014.pdfIn PDF document text
    • http://wukosow.epizy.com/nycdoe_calendar_2018-_19.pdfIn PDF document text
    • https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_cf7862fb4660434cae0824fe5e6d1025.pdf?index=trueIn PDF document text
    • http://ladurabazidema.onlinewebshop.net/fujufikurunozutelu.pdfIn PDF document text
    • http://zejibanunepi.myartsonline.com/zudelakesujiloxozatalibav.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_off0000d26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26C 5852 bytes
SHA-256: 7448b6abc143ba936fe0c6a5c4a9a5a7614300a904071c4b03632878c1982a98
font_01_sfnt_off0000e665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE665 11104 bytes
SHA-256: 9f35769a1b4859ee1b822fadc38d10316e660ad304b10065fcefd75db316e643

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