Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d7cdad03af7e281…

MALICIOUS

PDF

71.2 KB Created: 2021-02-18 11:25:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 930d9355f85400a12161974e81395532 SHA-1: b45b22f42a1ada0ae79d4f0ebdecee7b26a2a41e SHA-256: 9d7cdad03af7e2819ec4776e7be4b6597c7671aae03cf6539e3add6a6a3c1d9d
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used to distribute malicious content or phish for credentials. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful websites like 'jottigo.ru' and 'uose.xyz'.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/123?utm_term=explain+the+three+estates+of+france PDF link annotation
    • http://uose.xyz/what_is_the_main_difference_between_the_new_and_old_testament4p5xz.pdfIn PDF document text
    • https://tupodawemizaz.weebly.com/uploads/1/3/4/5/134594588/xiposijanid.pdfIn PDF document text
    • https://cdn.sqhk.co/reretukida/dYhhVif/marorejureramuxiz.pdfIn PDF document text
    • https://cdn.sqhk.co/wodaximewule/bgjZwid/walking_dead_finale_release_date.pdfIn PDF document text
    • http://circus.market/amusement_park_questionsbh6wt.pdfIn PDF document text
    • https://motanufogok.weebly.com/uploads/1/3/1/3/131381166/2ad65f4962d8f.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/lgggjjg/7360713120.pdfIn PDF document text
    • http://vostokzapad.su/nfs_heat_studio_app_ukebfgl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419192/normal_5fe7cc57c2719.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://s3.amazonaws.com/jijumupade/45399727644.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/waferojefipobuxasafis.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/child_benefit_claim_form_ch2_po_polsku.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/accumulator_types.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/luwovofufekipapedusuden.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD52 4916 bytes
SHA-256: 5b4366294ea2753e75fbe80b66606d586e39cadc914dce99b3a24ca2643730a1
font_01_sfnt_off0000ddf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF5 10660 bytes
SHA-256: 8fbc8be0ebb0aa5c5bd309b087f9b4a9ea3a85dd89da7f079baa61f1aaf2e2bb
font_02_sfnt_off000101e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E5 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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