Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c85049ce157c98…

MALICIOUS

PDF

117.5 KB Created: 2021-04-14 20:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5065dbdfddcae88ce017d9a884e3644b SHA-1: 20cdd942df4af0135e9bd1d55a2f80121bcc67c1 SHA-256: d4c85049ce157c989b60335427d6be492c0e3da7484b490257c39af4af55ee1e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further corroborate its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://maypoin.ru/strik?utm_term=how+much+do+military+dog+tags+cost PDF link annotation
    • http://uablog.website/gamigirenis3ppy0.pdfIn PDF document text
    • http://keepsufi.space/65424694200ubd7u.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/jgHhjgh/zifigijibomuluguz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393635/normal_5fd1f001dac51.pdfIn PDF document text
    • https://cdn.sqhk.co/givogaduta/jj7dhi3/fitbit_inspire_2_clip_holder.pdfIn PDF document text
    • http://qwert-ita.fun/xupax24087.pdfIn PDF document text
    • http://taforojujutusig.mygamesonline.org/how_to_soothe_plantar_fasciitis_pain.pdfIn PDF document text
    • http://worodariravo.22web.org/11375910025.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404965/normal_6056161e8fd5a.pdfIn PDF document text
    • http://fruittea.space/14699189031drffl.pdfIn PDF document text
    • http://gojawufeki.getenjoyment.net/sukobuvedufalu.pdfIn PDF document text
    • http://megoreboboni.22web.org/un_livre_pour_apprendre_le_francais.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480155/normal_601830fdd8c46.pdfIn PDF document text
    • http://itawegan.space/ge_4_device_universal_remote_codes_for_lg_tvfj3rf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380380/normal_602f7ff5da915.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e6ece5c8-dc70-4e5b-88e4-848a7a352461/quran_in_english_king_fahd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d52283eb-f81d-4cbc-879a-21696743423d/14890082424.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4b0fc1f-34e3-4d2e-9d4b-f14f3e799a62/fivizil.pdfIn PDF document text
    • http://mepitar.atwebpages.com/82197075094.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca99f612-6c52-4005-8c52-e52fb238f777/french_books_to_read_as_a_beginner.pdfIn PDF document text
    • http://losotejusegiso.rf.gd/danasawawawi.pdfIn PDF document text
    • http://koriwironawuva.myartsonline.com/scholarship_letter_sample.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FA0 8696 bytes
SHA-256: 7bdabc419950484ef06a2c7a4fdaaa13a1c8a07ebaedef1fc9d26d3bed4182d8
font_01_sfnt_off00017cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CAC 5168 bytes
SHA-256: 51b4f42243729b4633fbf778a2f06e3afaa6ebd1fdc2aee7a0a7527da6dcbd18
font_02_sfnt_off00018e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E4C 14788 bytes
SHA-256: 83e28367afc0848dd1bffd2e92ddd2d6d62985a18e277a7072e1f9b7ac34f3a0
font_03_sfnt_off0001b9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9F9 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333