Malicious PDF — malware analysis report

Static analysis result for SHA-256 17b3534c1fec58df…

MALICIOUS

PDF

78.7 KB Created: 2021-02-27 15:16:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 2b2ea330607391b226c072c718830170 SHA-1: 779c7d481653a46a3b84b15794a64c53bd29d3df SHA-256: 17b3534c1fec58df06d49f1d5f016dd9e30a721b53ff4665ccbc66c2696ae2ec
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The presence of numerous links, including one pointing to 'jumiwimov.ru' with a UTM term, suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate malicious intent.

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://jumiwimov.ru/123?utm_term=postoperative+complications+icd+10 PDF link annotation
    • http://disconto50.info/vevewomipalehxra.pdfIn PDF document text
    • http://domsale.xyz/aadhaar_card_sample16mvv.pdfIn PDF document text
    • https://cdn.sqhk.co/pedajobu/NgjjcHE/6263341894.pdfIn PDF document text
    • https://cdn.sqhk.co/kogewole/gKhbghc/paziwazutobobopivadak.pdfIn PDF document text
    • http://oneplusonemain.xyz/how_do_you_update_your_tomtom_for_free9ptkn.pdfIn PDF document text
    • http://acupofjacob.com/4213273730zia8k.pdfIn PDF document text
    • http://yandex-dostav.ru/26786607400m4863.pdfIn PDF document text
    • https://cdn.sqhk.co/fapewakuw/ificjie/zombie_survival_kit_gerber.pdfIn PDF document text
    • http://copyrightreports.com/69656990380fzvc7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/treatment_guidelines_for_metastatic_renal_cell_carcinoma.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/wedding_speech_template_bride_and_groom.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/tuwitobot.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/brancardier_formation_reunion.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_off0000f769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF769 5472 bytes
SHA-256: 3e143d3c845dd57a15fa3aa6013b22e84803b3205515c9945e1e86c60b8de113
font_01_sfnt_off000109f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F5 10504 bytes
SHA-256: 4cb55b5c095e54cd5d48a2bc4a0c2b240327885c2f3959ef42a747a25a6cf9ce

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