Malicious PDF — malware analysis report

Static analysis result for SHA-256 38e395ac2d66872f…

MALICIOUS

PDF

67.1 KB Created: 2021-03-31 10:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b37422e187c61a3674f96f082951441c SHA-1: f676af8fd523f05488d52d1d1d235be0bac006ee SHA-256: 38e395ac2d66872f5ac256496578b6bdf4da5f373e5a30ff92dda138ad24a3fe
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with a notable heuristic flagging it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the PDF structure itself are indicative of an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://druttle.ru/award?keyword=alcoholicos+anonimos+libro+azul+pdf PDF link annotation
    • https://lokamafurixese.weebly.com/uploads/1/3/4/5/134509290/0ce9ac80f1e3.pdfIn PDF document text
    • http://dusibarupuguli.medianewsonline.com/40647963476.pdfIn PDF document text
    • http://ziximotizaned.medianewsonline.com/ctet_answer_key_paper_2_2020.pdfIn PDF document text
    • http://rasazajafatirek.mypressonline.com/canvas_todataurl.pdfIn PDF document text
    • https://tefuvorarap.weebly.com/uploads/1/3/2/6/132682785/5998260.pdfIn PDF document text
    • https://wepidunobon.weebly.com/uploads/1/3/1/4/131452842/vaxotumotafofa.pdfIn PDF document text
    • https://mosazipabefo.weebly.com/uploads/1/3/4/7/134735261/c174d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zubiluwetij.myartsonline.com/how_to_setup_a_xfinity_remote_to_the_cable_box.pdfIn PDF document text
    • http://dezobod.onlinewebshop.net/what_is_a_pocket_juice_power_bank.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/watch_oz_season_1_episode_1_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/67255336046.pdfIn PDF document text
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_fe6882a6afaa47818664491a5b0ea082.pdf?index=trueIn PDF document text
    • http://rosajeku.myartsonline.com/heaven_casteel_saga_vc_andrews_books.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/zilewidavituwaso.pdfIn PDF document text
    • http://namuruxelakesig.rf.gd/water_pollution.pdfIn PDF document text
    • https://s3.amazonaws.com/jupoti/80390494919.pdfIn PDF document text
    • http://kiwasebax.epizy.com/36736491911.pdfIn PDF document text
    • http://tijuvewoduga.onlinewebshop.net/dopuvatebogexilome.pdfIn PDF document text
    • http://xivobotaxonid.epizy.com/35337957728.pdfIn PDF document text
    • http://modiwina.epizy.com/new_movie_site_top_10.pdfIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_f89431ab1bfa443d9183fa660fb34758.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_off0000c5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DE 5576 bytes
SHA-256: 73492a5e97f9298a0849f8d0ea1d3b5255d4c35a681c365a72972a9eb4fd1dde
font_01_sfnt_off0000d8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AA 11072 bytes
SHA-256: 11d3f8fc2d05e43a28819c637d19e8fadcca9f4bb12673b7d717ba4a1386a984

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