Malicious PDF — malware analysis report

Static analysis result for SHA-256 88da6e32d141570e…

MALICIOUS

PDF

81.8 KB Created: 2021-06-01 20:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 81145ee2ed612a6d02e8a9a6d7085c82 SHA-1: cdfbb961e34018d662f468f9169d1645514d480f SHA-256: 88da6e32d141570e31a5cc3ec33bc1a2b34e28e699b8f57e6263a95b209379cb
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of embedded URLs and the nature of the link farm suggest the document is designed to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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.
  • 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://bologen.ru/123?utm_term=loud+alarm+clock+sound PDF link annotation
    • https://jipibivit.weebly.com/uploads/1/3/4/0/134012636/1668499.pdfIn PDF document text
    • https://pefanesixalis.weebly.com/uploads/1/3/5/3/135329455/613182.pdfIn PDF document text
    • https://kubuvapag.weebly.com/uploads/1/3/0/7/130776206/fopigijigisumofex.pdfIn PDF document text
    • https://biwoponafi.weebly.com/uploads/1/3/4/7/134767969/9501193.pdfIn PDF document text
    • https://xijaxerunoseme.weebly.com/uploads/1/3/4/3/134306079/1334725.pdfIn PDF document text
    • https://wusukinepazewa.weebly.com/uploads/1/3/4/3/134372908/7687749.pdfIn PDF document text
    • https://gatevipamor.weebly.com/uploads/1/3/4/8/134878843/867569.pdfIn PDF document text
    • https://zenijubam.weebly.com/uploads/1/3/4/8/134884092/544632.pdfIn PDF document text
    • https://rivagusej.weebly.com/uploads/1/3/4/2/134266472/kenom.pdfIn PDF document text
    • https://zuxevuzefadum.weebly.com/uploads/1/3/0/7/130775429/fuzotalekubedi.pdfIn PDF document text
    • https://forelidik.weebly.com/uploads/1/3/0/7/130775511/woxufepazirarot.pdfIn PDF document text
    • https://raguwagoneneza.weebly.com/uploads/1/3/1/3/131384547/3255577.pdfIn PDF document text
    • https://fubolilodizewe.weebly.com/uploads/1/3/5/3/135312413/1055768.pdfIn PDF document text
    • https://nuwudune.weebly.com/uploads/1/3/4/3/134362296/60c3139b89123.pdfIn PDF document text
    • https://zewonawexekuke.weebly.com/uploads/1/3/4/3/134318694/e3deb.pdfIn PDF document text
    • https://patodenum.weebly.com/uploads/1/3/4/6/134657208/wunusuwirej.pdfIn PDF document text
    • https://bugemojumowos.weebly.com/uploads/1/3/5/3/135346690/41264.pdfIn PDF document text
    • https://josubolifixit.weebly.com/uploads/1/3/5/4/135400154/pavaguzubipegel.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
    • https://uploads.strikinglycdn.com/files/6d371279-efdf-4ac6-984e-0d45b85b6170/29560285044.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05e6cc61-d684-49d6-8242-0a57fe73513e/how_to_learn_the_pose_method_of_running.pdfIn PDF document text
    • http://wekibivu.pbworks.com/f/51528154063.pdfIn PDF document text
    • http://gulisapil.pbworks.com/f/tekken_5_psp_romsmania_usa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee291f01-9afd-4d1c-8d9a-62db02d31824/common_core_standards_california_grade_1.pdfIn PDF document text
    • http://podixarutib.pbworks.com/w/file/fetch/144473262/how_do_you_make_electrical_symbols_in_autocad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e88a76db-d7ec-448b-be08-bb3c78242079/pusufonerorove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7730938-dd25-4a75-bdc4-f86607396b72/how_to_delete_health_records_on_iphone.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_off0000f715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF715 4728 bytes
SHA-256: c430123670ea994104648d13243d4a72a92f0ac86b553e71e887b167fc71a770
font_01_sfnt_off000106fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FE 10716 bytes
SHA-256: aa6dff62a254082213fd734014c5f6ddfb07db4db348005a27b4e3655cc0392a
font_02_sfnt_off00012b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B79 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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