Malicious PDF — malware analysis report

Static analysis result for SHA-256 45f6a22b82045131…

MALICIOUS

PDF

75.6 KB Created: 2021-03-21 20:36:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c509c3407ded2e8811a56c358d1f687c SHA-1: 2c8aede8d300eafb6ebec08afb8c8016815f46a9 SHA-256: 45f6a22b820451315b57844cd5f6c7afa20f583dfab955781610d0fc0e9ff0c9
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many of which are part of an SEO link farm, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links point towards a malicious document, likely designed to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://xajibur.ru/wix?keyword=kenmore+he3t+washer+repair+manual PDF link annotation
    • http://bowuvudofi.scienceontheweb.net/what_is_cold_mountain_book_about.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/94746708920.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401989/normal_5ffb7727e449b.pdfIn PDF document text
    • http://vosajizegek.mypressonline.com/catheter_care_training.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383322/normal_602a1d7d4354e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421770/normal_602f6d287122e.pdfIn PDF document text
    • http://rolopigabetitu.scienceontheweb.net/what_is_base_rate_neglect_example.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427506/normal_604d6fa9e22fe.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/perurulexi/alcohol_in_pregnancy_guidelines.pdfIn PDF document text
    • https://d4cba69e-f3c5-4a64-9e40-69ba24924691.filesusr.com/ugd/b73feb_a89b53de054148ad841b3b325d11b373.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zidenigad/gorole.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/kakaotalk_modded_apk.pdfIn PDF document text
    • https://684917c6-b594-4497-9ea4-141105166a5b.filesusr.com/ugd/0dc9f5_f35901d9b2c7498986bb96f20a4b1e6e.pdf?index=trueIn PDF document text
    • https://c827806f-f9bf-4fd3-a4ce-e487c020fa79.filesusr.com/ugd/6fd45c_a8743e9f2f734ca8aa91392a568b4276.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/mudobesemop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05a6c2bb-3d96-4423-b97b-4e50f1d50c83/mirro_8_quart_pressure_cooker_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/net_framework_4._03019_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/find_subgame_perfect_equilibrium_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f185964-bd22-4ddc-9669-b9af60791491/ms_project_2019_free_download_64_bit_with_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/ranetazavitimapire.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/block_strike_mod_apk_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/doxology_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b580d4d-a6a3-4234-8a32-6ca9fe7515f9/conda_pygame_python_3.6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b626c9d5-33cf-42e5-82b1-222784f29939/oracle_12c_download_32_bit_linux.pdfIn PDF document text
    • https://79d86aa2-23c4-4aa0-a0dc-c16ac59ae55d.filesusr.com/ugd/ecb701_88123bae5d5641849b32db3af6941f78.pdf?index=trueIn 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_off0000e95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95E 5284 bytes
SHA-256: c62cde5338398aa4ba7edee51b394d32551a96b7e314cdbeaf48cbb3e5db343d
font_01_sfnt_off0000fb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB45 11016 bytes
SHA-256: 2471336cb7e98516bfcd9488e645d453f91f4da3b1e248eafdeddc92be22c6f2

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