Malicious PDF — malware analysis report

Static analysis result for SHA-256 f668754c44d571d5…

MALICIOUS

PDF

81.9 KB Created: 2021-02-13 05:39:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d313655d47d43a1d2bb85be9892871b9 SHA-1: e1c59a644a2f985f79c83531ab6c851371cc22c5 SHA-256: f668754c44d571d589d004b919f44e09fb737773b48f7d7985949d8f6c970b50
126 Risk Score

Malware Insights

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

The PDF file contains multiple external URIs, with one specifically pointing to a suspicious domain 'crophysi.ru' and another to a link farm on 'weebly.com'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site.

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
  • 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://crophysi.ru/123?utm_term=training+camp+11+empires+and+puzzles PDF link annotation
    • https://dibumofum.weebly.com/uploads/1/3/5/3/135313591/batarobogogutuk.pdfIn PDF document text
    • http://g2am2e.xyz/introduction_to_programming_in_java_an_interdisciplinary_approachuw7bw.pdfIn PDF document text
    • http://santecmb-sarl.com/najegurunureq5v1j.pdfIn PDF document text
    • https://berisojelo.weebly.com/uploads/1/3/0/8/130874511/poxugijepomoxe_venaniregobuz_nemebos.pdfIn PDF document text
    • https://cdn.sqhk.co/bepifopid/d4gchcH/elves_vs_dwarves_echs_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/wirowanorax/gdZYidw/34293679940.pdfIn PDF document text
    • https://cdn.sqhk.co/wunokebewoz/hfrwfrM/renazowavex.pdfIn PDF document text
    • http://aromaita.space/82502942746d4sb5.pdfIn PDF document text
    • http://affilateapp.online/exploring_our_world_textbookeam65.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxofidipo/roheIjj/89580537952.pdfIn PDF document text
    • https://cdn.sqhk.co/pezolaje/cjijfja/10037021808.pdfIn PDF document text
    • https://cdn.sqhk.co/livukigelo/ee22SIu/slot_car_tracks_melbourne.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://miviloliwibo.rf.gd/virek.pdfIn PDF document text
    • http://bonitadobizaw.epizy.com/broken_heart_love_images.pdfIn PDF document text
    • http://vatapusaf.rf.gd/1372802521.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001001d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001D 5444 bytes
SHA-256: 351ce3dea523e1025e7adc23202b115fa6ceab44f41c951e1bb06987ea9b6ecd
font_01_sfnt_off00011297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11297 11680 bytes
SHA-256: f7a214029926cd933f3dd791e4453cc28ab6438a03f0af07587e7b7503ed363f

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