Malicious PDF — malware analysis report

Static analysis result for SHA-256 657aa0ca8f753d5e…

MALICIOUS

PDF

75.5 KB Created: 2021-03-26 17:28:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b1ca3ef3ce8dcfe2a061361c9865e3a5 SHA-1: 046c90aad48b22d86995ea41d675c8087d5a4531 SHA-256: 657aa0ca8f753d5ec9d5b8cb1c807c95eed9b2d73d123baa8ba798470c9b27a7
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 point to PDF files, suggesting a link farm or SEO poisoning tactic. One of the primary URLs, 'https://jottigo.ru/123?utm_term=comparing+and+ordering+fractions+worksheets+with+answers', is likely a lure to a malicious site. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://jottigo.ru/123?utm_term=comparing+and+ordering+fractions+worksheets+with+answers PDF link annotation
    • http://rumigiwataj.getenjoyment.net/taxudeguxobibovunuvudanuj.pdfIn PDF document text
    • https://sukodijam.weebly.com/uploads/1/3/4/5/134516983/e207ab2e00d1cdb.pdfIn PDF document text
    • https://foxevavudutis.weebly.com/uploads/1/3/4/3/134380199/sojivunolum-zegobukojijugip-dixisaj.pdfIn PDF document text
    • https://miremawa.weebly.com/uploads/1/3/4/6/134631892/3479713.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/lixuduwonifa/pakevaxu.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/south_korean_alphabet_pronunciation.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/palatusuvi.pdfIn PDF document text
    • https://368af19b-b9be-4417-8ea7-dfc4611f9fec.filesusr.com/ugd/abd4c0_3b56de72738a413fac69f67c3070d9ea.pdf?index=trueIn PDF document text
    • http://jarepumemaxi.onlinewebshop.net/lepagapivegad.pdfIn PDF document text
    • https://e966359d-176b-477a-9ad9-c314bea94227.filesusr.com/ugd/fa6f14_9f8bfa5f449d4f9f8204182840dfdd8d.pdf?index=trueIn PDF document text
    • https://d99d9bf7-a5e0-49f2-90ac-0d1bc881463d.filesusr.com/ugd/0182ef_057643360d1345b1a04facc6998ce8df.pdf?index=trueIn PDF document text
    • https://26aaa629-0581-4e25-ae32-a194504e59ab.filesusr.com/ugd/2d4e87_f797117f9fd3419792a1ba0c4000267c.pdf?index=trueIn PDF document text
    • https://3a0d5408-2ea1-4258-8d29-5d96341cad2c.filesusr.com/ugd/79cb75_670bc1b82bc84eef917e29ecee038810.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/girl_woman_other_by_bernardine_evaristo.pdfIn PDF document text
    • https://6d428a25-da86-44fa-8f13-5b0f09742281.filesusr.com/ugd/3649d2_9fd1722d7a3c4a97a6e1ed2b2818c015.pdf?index=trueIn PDF document text
    • http://fepusum.onlinewebshop.net/14333366389.pdfIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_b9ecc39e56b14ab4a00afb9a0d6777ad.pdf?index=trueIn PDF document text
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_38c7434ed6c24ac3b7d081fc8378783f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/fepanotem.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/2733863750.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/48968495147.pdfIn PDF document text
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_a3d72197fe964076b2cc682ee8a50a4c.pdf?index=trueIn 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_off0000e7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AE 5596 bytes
SHA-256: 11faa4b56d2e697bfaad7386a727df568efcc386b61f4527fb6fd45fd2cdc59c
font_01_sfnt_off0000faa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA0 11004 bytes
SHA-256: 3f31e0452dfd4efbf26896abd44af1f5ed47706f279e76beadbad75a50a2d601

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