Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31a54443910fa9a…

MALICIOUS

PDF

167.9 KB Created: 2021-03-26 08:27:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 719123645f3805775938500f722e13eb SHA-1: c8f2886cd13dc1e80e191de8ceab5d16a4d923c7 SHA-256: d31a54443910fa9a3d0bc6c25b49d5a1c5d1c733f045d1744035fcc5186bfd52
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure strongly indicate an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://golowaki.ru/wix?keyword=ffxiv+spiritbond+5.2 PDF link annotation
    • http://future-techno.ru/visumavodegujizlpezk.pdfIn PDF document text
    • http://podarokinsta.online/counselling_skills_for_managers_kavita_singhgb1rl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374178/normal_602f3a310a4a3.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovixovuti/ajaHvhd/top_50_best_classical_piano_music_download.pdfIn PDF document text
    • http://strapslap.online/vonavazosefidoy5ld4.pdfIn PDF document text
    • https://cdn.sqhk.co/liripudeb/jhibx9O/terminator_dark_fate_full_movie_download_free.pdfIn PDF document text
    • https://cdn.sqhk.co/nopusixinid/yk0Rjj0/kopuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476569/normal_5fe90ff4218a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386830/normal_5fddae4bacc17.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/rujabepifar/2161259146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01af1529-5043-4a5e-8ea5-c42af0a2faf3/tebanamisam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30a2fcb5-7011-40f9-ace0-f4f595d07df6/guia_de_primeros_auxilios_para_nios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d30267ed-c07b-4795-9ba9-0a65b702727b/80732563773.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a753b8d0-aa2d-41c5-b2e1-6eeb127c0f9c/are_weighted_blankets_good_for_your_back.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b785981b-8b5b-433b-b94d-970418031351/vampire_diaries_season_1_episode_6_soundtrack_list.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/85324078418.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/cg_police_model_answer_2018.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00024239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24239 5304 bytes
SHA-256: 979f421f53f2412ffdf1c0633a883159d5ef124eac6229dff7ef7149afcfd636
font_01_sfnt_off0002546c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2546C 11708 bytes
SHA-256: 8b2aefab2abcd7994eb813bf6ec1b9a8f77c8c0f468d607ff5d19397a141be1a
font_02_sfnt_off00027c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27C63 16220 bytes
SHA-256: fcf4df20434c0157abe8648236fb4eaf8c2b118e66912a2ecff83a8946e6baa8

Open this report in the interactive analyzer, or submit your own file for analysis.