Malicious PDF — malware analysis report

Static analysis result for SHA-256 549b0ca378b8dc65…

MALICIOUS

PDF

89.5 KB Created: 2020-11-18 01:42:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e6959b1ed577fd6e8dec33dc98adcb54 SHA-1: 11cc1a19a8c20f7330859a41e7f4fab6769c8f02 SHA-256: 549b0ca378b8dc65b0b38a9e9884c4a6aaadcf36a4064892967e262865782b37
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors and link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO abuse to drive traffic to malicious sites. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://ggtraff.ru/123?utm_term=chapter+2+test+form+2b+algebra+2+answers In PDF document text
    • https://wesoxiworikezux.weebly.com/uploads/1/3/1/3/131380467/tegor_buxunuzuz_kajijisasugizen_buzavifefe.pdfIn PDF document text
    • https://megadezatesaram.weebly.com/uploads/1/3/0/7/130776649/c6125786ce3e.pdfIn PDF document text
    • https://zujususo.weebly.com/uploads/1/3/4/6/134615591/6248203.pdfIn PDF document text
    • https://tefufujilidawa.weebly.com/uploads/1/3/4/5/134578337/cd55e7845ea6.pdfIn PDF document text
    • https://setekonireza.weebly.com/uploads/1/3/4/1/134131298/91339d31.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/lazolu/vatican_news_app.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/ocean_photicular_book.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/total_gym_1700_club_spec.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fed63995-03c9-4d07-94fc-b21e012c54a8/vulux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d72faab-c385-41f2-a38c-a218445377ea/sixuvadexo.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/prentice_hall_algebra_2_answer_key.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10729 5584 bytes
SHA-256: 711664c63b70e475fc34e5a1b504f8146b62811bb68320266d81346b2904948f
font_01_sfnt_off00011a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0A 12548 bytes
SHA-256: 1a67d1f935c59ed51d4d8346454fd94ec868cbd9f9a4d5a59449547538ebf160
font_02_sfnt_off00014467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14467 16072 bytes
SHA-256: 4ce97752c8d1ed0b0302a1507788019c6b738cc3ee96ca273f61f92c287db7cd

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