Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac6e12ac5da10cd…

MALICIOUS

PDF

88.3 KB Created: 2021-02-17 22:42:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 419188c51e7728401d6eeaaac7160fd9 SHA-1: 177b799b45dd747e485d6a174208ecff36ce1894 SHA-256: aac6e12ac5da10cdc1eb002603762457d4bf22ae63600ed815ce1b99e18ad30b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to S3 buckets, suggesting a link farm or SEO poisoning attempt. One of the primary links redirects to a suspicious URL related to printer setup, likely a phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing trojan.

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://leonvi.ru/strik?utm_term=hp+deskjet+3050+all-in-one+printer+series+-+j610+wireless+setup PDF link annotation
    • https://xilasofuvi.weebly.com/uploads/1/3/4/6/134651230/jexijoma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371247/normal_602577e07089c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372376/normal_5fce5eed74bbd.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosewude/hjeiehi/zombie_catchers_all_boss_zombie.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451028/normal_5ffbd3f85ea1e.pdfIn PDF document text
    • https://cdn.sqhk.co/bosamame/mjijjhc/vusixopimemuj.pdfIn PDF document text
    • https://lusogovo.weebly.com/uploads/1/3/4/3/134358567/kesuzamojopipog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jasadavebaga/the_crown_imdb_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/bcp_call_tree_template.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/autosketch_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/project_schedule_template_online.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/tirigolobeduvuzo.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/xaxurelo.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/pisupitipuzudawesuguter.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/genetic_programming_an_introduction.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/dipedonurak.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/minecraft_1._0._8._1_free_hiapphere.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_off00010cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFE 5696 bytes
SHA-256: a1097c7c27f0e4e3f1adea864fc2c162b342746e0c45e95791d930a46136bd76
font_01_sfnt_off0001208e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208E 10732 bytes
SHA-256: 8413906f2cab5f202523e3d18fb83274af226cfe4547b12f4b33abff70efb884
font_02_sfnt_off0001454d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1454D 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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