Malicious PDF — malware analysis report

Static analysis result for SHA-256 423a6e9a382e49b8…

MALICIOUS

PDF

76.0 KB Created: 2021-05-14 07:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 36cfd9d19f63435a2458d0ead3e69e19 SHA-1: a8d2b26ffd5e20bc985d4421876ddca9d4dee273 SHA-256: 423a6e9a382e49b8f683341c40245af6c161a6e51dd42e0cb78fb3941d8ddade
244 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It contains a significant number of embedded URLs, many of which point to disposable domains or redirectors, suggesting a link farm or phishing attempt. One critical heuristic indicates a link to known malicious redirector infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://dafemum.ru/strik?utm_term=how+to+draw+graph+function In PDF document text
    • http://zedanipon.iblogger.org/deguxa.pdfIn PDF document text
    • https://viforiler.weebly.com/uploads/1/3/0/8/130874197/9358400.pdfIn PDF document text
    • https://wakukaxowemaba.weebly.com/uploads/1/3/5/3/135303752/wovabo_nebegi.pdfIn PDF document text
    • http://wofeboz.66ghz.com/simple_english_story_book.pdfIn PDF document text
    • https://pejudipevunasu.weebly.com/uploads/1/3/5/3/135351173/5316d15ace.pdfIn PDF document text
    • https://bazeliwelari.weebly.com/uploads/1/3/1/8/131857734/fevoran_xetexu.pdfIn PDF document text
    • http://gojepifega.22web.org/tadajiwegulajewedetidav.pdfIn PDF document text
    • https://ramageputa.weebly.com/uploads/1/3/1/6/131637054/topuso_judeso_gerasijovopor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dezezefisimel.rf.gd/bokupokugo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efe77de5-0631-465a-aa90-7bca757e344d/how_to_calculate_radius_on_google_maps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a377465c-37f8-4916-8e57-73c73a81abc3/zadajekipamopesi.pdfIn PDF document text
    • http://sejixopur.rf.gd/how_to_construct_an_equilateral_triangle_with_a_given_side.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2de67741-a6b0-4567-ae58-5f2b3c725c42/23542346883.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfb542a4-8e2f-475f-92c3-ae7f86731fc8/sherlock_holmes_2_movie_download_in_hindi_1080p.pdfIn PDF document text
    • http://bopuxenuxesozu.rf.gd/wivivap.pdfIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_de73cfcb3d8245b3abf482f05e61aee4.pdf?index=trueIn PDF document text
    • https://08202b68-adf4-4b7d-bb06-fcebe54c78b8.filesusr.com/ugd/76dd3d_703678506b4744c6be2d1c7f5e0a7f6e.pdf?index=trueIn PDF document text
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_b838da618a4c44fab5f6f1c441b095a5.pdf?index=trueIn PDF document text
    • http://gevitejivojo.rf.gd/59874823312.pdfIn PDF document text
    • http://kerakuwopimarin.epizy.com/bolipafixomefiduzixafed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/112ed68c-a97c-41f5-a562-63516164d966/95149066922.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6c9ef90-b3a7-46d0-8e3d-1054e1573ea2/how_to_load_bosch_silence_plus_44_dba.pdfIn PDF document text
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_9e5d29dc2e90452b91379fc1ed265885.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_off0000ea08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA08 5260 bytes
SHA-256: 34e57139069c14ed69820a22ebd6fb46f6a97cee9f87764f3068bffb77776f76
font_01_sfnt_off0000fc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC01 11392 bytes
SHA-256: 1348f2ea92634fe373abea34b525898e6e6474ae5324fcde74cf2870c0d46038