Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd1a42a11a4c56c…

MALICIOUS

PDF

69.1 KB Created: 2021-02-14 04:39:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c44fc4d7742176904be6f311cf609f7f SHA-1: 539fe1e9356d91f811449cc2e87df4884afa9edd SHA-256: 7fd1a42a11a4c56c6810099f77719c58b8d3d765121c7ccebd651650cf54b156
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a PDF_SEO_LINK_FARM heuristic, suggesting an attempt to manipulate search engine results or redirect users to potentially malicious sites. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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=craig+soundbar+cht921+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459922/normal_5fe43c7d6e9d5.pdfIn PDF document text
    • https://zaroralovez.weebly.com/uploads/1/3/0/8/130814195/bomewebisawifevafipa.pdfIn PDF document text
    • http://setakini.22web.org/foremowo.pdfIn PDF document text
    • http://lujuvudav.22web.org/zisunutosuzanodopaso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445125/normal_5fcdb21c5c4e1.pdfIn PDF document text
    • https://girowotejetut.weebly.com/uploads/1/3/1/4/131406843/1705769.pdfIn PDF document text
    • https://wesonibisizigoj.weebly.com/uploads/1/3/0/9/130969529/9398283.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465025/normal_5fdedcf06a4ed.pdfIn PDF document text
    • http://gafegenuwegapok.iblogger.org/nezelavewuxudutejudikep.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/lerezazo/cbs_mystery_theater_episode_guide.pdfIn PDF document text
    • http://niwuzowebod.epizy.com/marketing_research_report_preparation_and_presentation.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/penoliloxana.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/24173999512.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/node_js_udemy_course_free.pdfIn PDF document text
    • http://binawojojin.epizy.com/contrapunto_primera_especie.pdfIn PDF document text
    • http://suwuxuk.epizy.com/japanese_app_store.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD13 5740 bytes
SHA-256: 775fa7465e619d1ae7ff7702af51f3ec0315eda3c3da2f1dea59dc8da9c41ba6
font_01_sfnt_off0000e069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE069 11084 bytes
SHA-256: 6e1ce2deb10767bc7d44641d37f69c154272285b3f5e67cdc3a72bf85235ef37

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