Malicious PDF — malware analysis report

Static analysis result for SHA-256 d840b262f3daefab…

MALICIOUS

PDF

70.8 KB Created: 2021-02-09 06:53:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9b5cdd6337d43bba05ac330568adb655 SHA-1: b8e91391f33b9596913ce3096aa94b71ad71d455 SHA-256: d840b262f3daefab046e3836abdec1e6130e5645d149a669fc64c73c21b3adec
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to 'free excel spreadsheet for windows 10', which serves as a lure to entice users to click the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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/aws?utm_term=free+excel+spreadsheet+for+windows+10 In PDF document text
    • https://cdn.sqhk.co/mamevugixej/injfjgd/star_realms_online.pdfIn PDF document text
    • http://fisidunetozusi.iblogger.org/bobefolulup.pdfIn PDF document text
    • http://mavitrade.com/58260015149hwpcg.pdfIn PDF document text
    • http://ibkreactiva2020.com/subscribers_counter_livew6fcl.pdfIn PDF document text
    • http://dwatches.site/30736070065gct4y.pdfIn PDF document text
    • http://easterthjg.com/duvepofupototimaauwgm.pdfIn PDF document text
    • http://fertpin.online/45697721708rjom6.pdfIn PDF document text
    • http://nanewak.iblogger.org/business_letter_spacing_format.pdfIn PDF document text
    • http://pusikoxelumide.iblogger.org/xorevode.pdfIn PDF document text
    • http://healthyforczechrepublic.site/secret_language_of_birthdays_ebookqk7f3.pdfIn PDF document text
    • https://cdn.sqhk.co/dodufiruw/haPKjjx/wifuwimajasodepako.pdfIn PDF document text
    • https://cdn.sqhk.co/lokuwanij/hbwghx8/27320718858.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pikididubemet.epizy.com/malaria_prophylaxis_cdc_guidelines.pdfIn PDF document text
    • http://vuduluxepo.epizy.com/candida_glabrata_uti_treatment_guidelines.pdfIn PDF document text
    • http://sonituzesubilit.epizy.com/surface_area_of_prisms_worksheet_grade_8.pdfIn PDF document text
    • http://tidewoxawutose.epizy.com/psychology_intake_form_template.pdfIn PDF document text
    • http://nifiwirijapokaf.rf.gd/fivon.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_off0000d6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DC 5552 bytes
SHA-256: 43f739460512887959b057e1a7c13708a6deeea15a57eafafe23a637a968c9df
font_01_sfnt_off0000e9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DB 10616 bytes
SHA-256: 33a9f8cce97c9b4c7d99eebecf7b1a681c0bf3a3074997c2490f1869e3045855

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