Malicious PDF — malware analysis report

Static analysis result for SHA-256 4133d6e5b048b7dd…

MALICIOUS

PDF

75.9 KB Created: 2021-03-22 07:22:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: d09f68bb480f7b97f9dffe337527f412 SHA-1: f79e308a44dd30159d61343634779718293521f8 SHA-256: 4133d6e5b048b7ddd62caaaeb6d88876f43b634dc8461a9a8c63207e4d713946
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains an embedded URL that redirects to a link farm, a common tactic for distributing malware or conducting phishing. The document body, though heavily obfuscated, suggests a lure related to writing biographies, which is likely a pretext to encourage users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gimoguvi.ru/strik?utm_term=how+to+write+a+short+biography+about+someone+else PDF link annotation
    • http://vuwimoxit.mygamesonline.org/68360559212.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373522/normal_5fe5fc564929a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481821/normal_5fe2d3a65a32d.pdfIn PDF document text
    • http://sbrf.link/xudewifafuvafufatuparux59oxc.pdfIn PDF document text
    • http://appletopshop.ru/xevakugagaludewnymc9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416786/normal_5fdd43111a746.pdfIn PDF document text
    • http://megatorg.ru/all_i_want_for_christmas_is_you_piano_sheet_music_musescore053pl.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/povodijirig/daxuwobiz.pdfIn PDF document text
    • https://48e6b720-b653-4920-beb0-7ef171ab6ab9.filesusr.com/ugd/d9d1f5_40a1a35b11034fe1a3ff9e539df1b53e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/befafuni/rezaw.pdfIn PDF document text
    • https://a2fe464c-28d1-4db8-bb2d-552ad9bc2f4d.filesusr.com/ugd/941bb1_9f517ef0bbde4c4d91dc9072f4a18b4a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/bootstrap_4_template_sample.pdfIn PDF document text
    • https://6129906d-bc82-46a7-99f5-71793a58af3c.filesusr.com/ugd/d162e3_39d2df6c19b241c38679d11d1b2fd14b.pdf?index=trueIn PDF document text
    • http://lafagelupuf.myartsonline.com/classification_of_antipsychotic_drugs.pdfIn PDF document text
    • https://8084a2ae-6cfb-493d-8155-0d4219c0f7e3.filesusr.com/ugd/5b3528_d99f8ca6268f4a39aa4286a7b2ad1d05.pdf?index=trueIn PDF document text
    • http://rorokepu.atwebpages.com/kiran_publication_computer_book.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_off0000e982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE982 5528 bytes
SHA-256: 090d57eb26db2c37646319fa7b3f874cb88440718fa7786ecdec01b28b34c461
font_01_sfnt_off0000fc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC35 10716 bytes
SHA-256: 019793b20c80d2ea7f6294d189ffeb9dc0408654df619075c9129491eb20f1bf

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