Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c476a2fd3b531e…

MALICIOUS

PDF

75.6 KB Created: 2021-04-02 16:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 152b3ac0899348d10d0171988758ff6d SHA-1: 1f9d7eabdfbe5dd46a87d2bf6004b9eedc8f560a SHA-256: e4c476a2fd3b531ebcfd2cc15fc4f1e50a533a2c48604f2afd16c70f6fea5e1c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, possibly exploiting PDF vulnerabilities or serving as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://lozipotod.ru/award?keyword=mathematical+physics+by+satya+prakash+download+pdf PDF link annotation
    • http://my-favshopf.online/behringer_q802usb_xenyx46uh8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465149/normal_602e614a596d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488570/normal_5ff24e0525181.pdfIn PDF document text
    • http://lotsmen.com/lexijabitufekenuruexon3.pdfIn PDF document text
    • http://teatr-art.com/how_to_use_google_translate_camera_iphonex7qln.pdfIn PDF document text
    • http://difavusimope.iblogger.org/att_induced_hepatitis_guidelines.pdfIn PDF document text
    • http://nesobaka3.xyz/kuwasxd9w1.pdfIn PDF document text
    • http://ribozigokadime.iblogger.org/15213518156.pdfIn PDF document text
    • http://paxibokojusaduw.22web.org/requirements_prioritization_matrix_template.pdfIn PDF document text
    • http://liolika-rsya.ru/975882759829111u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384160/normal_5fd76be2af4a4.pdfIn PDF document text
    • http://testertumentum.space/79371916886zpv6l.pdfIn PDF document text
    • http://pochta-24.cc/wasupunikonobaxawuburon4ki.pdfIn PDF document text
    • http://twobigs.space/50685875982cgnor.pdfIn PDF document text
    • http://terem.space/4d_king_live_4d_results_apk5npl6.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
    • http://tefagagegupavos.rf.gd/animal_kingdom_series_parents_guide.pdfIn PDF document text
    • http://dupikupujetilu.rf.gd/69526359255.pdfIn PDF document text
    • http://mabalipa.epizy.com/chirutha_audio_songs_ing_please.pdfIn PDF document text
    • http://faduzidivatakid.epizy.com/14715288796.pdfIn PDF document text
    • http://jatukoris.rf.gd/bhagavad_gita_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/371bb0af-6c11-4dc5-978f-057011fb8acc/leposatamidaniso.pdfIn PDF document text
    • http://zaniwemikadas.rf.gd/xinebadima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aebee1cc-fdca-4476-ba6d-bdeb64eb6455/zesufi.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_off0000d76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76A 5588 bytes
SHA-256: 655cffd6168d9440578bb4e3ed8e6866fbc825c119ef5d7a3a642c95f3cdba33
font_01_sfnt_off0000ea51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA51 11692 bytes
SHA-256: dc8b6587165bb9e1ef491e269926c66620129c7d60fa89f571a6679607088f98
font_02_sfnt_off00011230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11230 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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