Malicious PDF — malware analysis report

Static analysis result for SHA-256 0385c444d2d22f80…

MALICIOUS

PDF

79.3 KB Created: 2021-01-03 04:21:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: eb9ef918d084fd882c6256a608a480dc SHA-1: 9d1f53800820fa5a23b34ebb4d5f6345cb600e0d SHA-256: 0385c444d2d22f8049fdec8ea8fea11f28973e6c761a1a4102d820c068cd1651
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'ML_NYX_PDF_MALICIOUS' strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to 'team beep test software free', suggesting a lure for users seeking software. The presence of numerous external PDF links, including one to a potentially benign textbook, further supports the idea of a link farm used for SEO poisoning or distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ggtraff.ru/aws?utm_term=team+beep+test+software+free In PDF document text
    • https://nawowelefet.weebly.com/uploads/1/3/4/4/134498780/warugeweko_puvanug_novojufal_nudub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374859/normal_5fc59c4031690.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451755/normal_5fa93a7c63845.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406473/normal_5fb6c44f22f92.pdfIn PDF document text
    • https://nazesamujev.weebly.com/uploads/1/3/1/3/131397942/2508648.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385235/normal_5f9b2c43bff7f.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/jikopot/nationalism_in_india_class_10_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/counter_strike_condition_zero_english.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/sherlock_holmes_the_abominable_bride_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/11851223397.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/titration_curves_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/15565501831.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/29111253375.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/mavunufozosafojadonu.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE437 5196 bytes
SHA-256: d9945cfa09f3da95bfc38abb65f891c4f95713f00d335a15eadd08e1b55896b5
font_01_sfnt_off0000f5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DE 11056 bytes
SHA-256: 35a6e7ec551d4fd513b9b18824db8ec58fb970ac149d2ec17f883b947f88e203
font_02_sfnt_off00011b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B73 16064 bytes
SHA-256: 6f17b99764d671a96c0d2fd0b5f339513c2ddbf7efa5d755f63b897ad21dd613

Open this report in the interactive analyzer, or submit your own file for analysis.