Malicious PDF — malware analysis report

Static analysis result for SHA-256 5899c874b2ef1096…

MALICIOUS

PDF

77.7 KB Created: 2021-02-28 01:17:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 50c23e276e4461c5d4a51ac20359f0f1 SHA-1: 0e40d3cc1ab7964c6bcf118529baa976a280017b SHA-256: 5899c874b2ef1096e00b07e5ca380576648c3d1524555c7a024a619bcb0eb065
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains a title related to scrabble, which is likely a lure to disguise the malicious nature of the links.

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
  • 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://jumiwimov.ru/aws?utm_term=how+many+points+scrabble+use+all+letters PDF link annotation
    • http://svoydvalend.xyz/toca_el_piano_in_english35jhr.pdfIn PDF document text
    • http://helper-badges.com/online_radio_softwareo1jd1.pdfIn PDF document text
    • http://vefaporuzudu.iblogger.org/dark_gray_shirt_template.pdfIn PDF document text
    • http://elerctum.org/vuxobt1rbd.pdfIn PDF document text
    • https://turetufifej.weebly.com/uploads/1/3/4/5/134500159/4284674.pdfIn PDF document text
    • http://pozijuza.scienceontheweb.net/legozudawepuvoxa.pdfIn PDF document text
    • http://sberbank.link/pojerajowemiwomavawenosnvi2i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dapomajaberi.epizy.com/xepezel.pdfIn PDF document text
    • http://fojiguxojed.epizy.com/ritowul.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/54539059386.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/before_sunset_english_subtitles.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/sentencing_council_definitive_guidelines_burglary.pdfIn PDF document text
    • http://rigitusavogu.epizy.com/2018_south_movie_new.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/short_biography_template_word.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_off0000e717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE717 3052 bytes
SHA-256: 7802519ba852472aa858602d14a21f68c55fcd4ebf407a5c1f8676605eb042d5
font_01_sfnt_off0000f20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20D 5376 bytes
SHA-256: 2e9d564e265374201c5a97faca3234f0815f9f2fbd9a12ea1b8209fa31e7655d
font_02_sfnt_off0001044d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044D 10752 bytes
SHA-256: 58f14d31d5b8dfafcfd5dfa6b6ba953265317a3cc3ee1d43b653a1e16b3af153

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