Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6fc49234f3b26b…

MALICIOUS

PDF

69.7 KB Created: 2020-12-23 00:58:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 61370aaa23c71101dfd0136f159cee3b SHA-1: 97146843ae94955eedfb4e452c4c702530acfe72 SHA-256: da6fc49234f3b26b6ca894dd88cf4828db9e5a6691d2fa489eb1388333fd31af
214 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 links, with one identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a tactic to distribute malicious content or engage in SEO manipulation. While no scripts were explicitly extracted, the presence of embedded links and the ML classification strongly suggest malicious intent, likely to redirect users to phishing or malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://cctraff.ru/aws?utm_term=vauxhall+holiday+park+entertainment+guide+2018 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4410432/normal_5fc6c48de3aff.pdfIn PDF document text
    • https://ninijaliwejito.weebly.com/uploads/1/3/4/3/134350726/165ae7e.pdfIn PDF document text
    • https://pelosewedi.weebly.com/uploads/1/3/4/7/134753512/4735710.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366956/normal_5f9dd3329efea.pdfIn PDF document text
    • https://mutakisutuw.weebly.com/uploads/1/3/4/7/134768563/loxojo-lozofejumonuxu-xosetakoloxu-levifepemim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc5145da3bf4b14abc40464/t/5fc558e31972c46e3c501877/1606768867353/chiang_mai_map_night_bazaar.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/master_gardener_handbook.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fe12c38d17c8b74f75b9d7d/t/5fe270da3affca5cf43d0438/1608675546996/pumuvamiveme.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5b65d6609fd0ee7b27781/t/5fcebdbbe4d8f2662cfd4036/1607384508394/wupofunetozat.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/53251012460.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/xivimusebavivonovatuses.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc695a917e720264011615a/t/5fd15064f580b17510012ebf/1607553124037/reapers_revenge_discount_tickets_2020.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_off0000cf2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2F 5912 bytes
SHA-256: b98fba35dd1bbfbc78d33c0096dcdf248290899df4d5024e00978572d7481c06
font_01_sfnt_off0000e339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE339 11056 bytes
SHA-256: 64c6216bb42718334fccdb3f3ed46f552a26d648718846e1bef76f37558754dd

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