Malicious PDF — malware analysis report

Static analysis result for SHA-256 791f9c3f98201f38…

MALICIOUS

PDF

76.8 KB Created: 2021-04-27 17:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cc52493b2d2c98a2fe1813613ee5240 SHA-1: 7c2bc371c72569020535b39514587a24cd45403d SHA-256: 791f9c3f98201f3854dd7d046a8c5f6486a8ddd7eea5a688c9b2ca49917905f2
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to 'Kidde smoke detector battery size', likely a lure to direct users to the primary malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=kidde+smoke+detector+battery+size
    • https://bafokaxaxex.weebly.com/uploads/1/3/4/8/134881351/kixono-bojatadet-gokipumevozun.pdf
    • https://vovowiki.weebly.com/uploads/1/3/2/3/132303124/34a08176c7.pdf
    • https://cdn.sqhk.co/bubuzibiv/H1ifcio/88021226734.pdf
    • https://tavabaxo.weebly.com/uploads/1/3/1/0/131071290/7630387.pdf
    • https://cdn.sqhk.co/zaviresodew/jcjbdja/53725686972.pdf
    • https://legoxadev.weebly.com/uploads/1/3/2/3/132302888/muvilitate.pdf
    • https://cdn.sqhk.co/pixorikibam/0Njchhf/97379838696.pdf
    • https://vawuzusafut.weebly.com/uploads/1/3/4/8/134863851/c3e6f33e516.pdf
    • https://dibotora.weebly.com/uploads/1/3/4/8/134870334/wasesob.pdf
    • https://cdn.sqhk.co/fowipovoji/jf6Bkjh/el_arte_de_la_guerra_gratuito.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/geraromu/14769945844.pdf
    • https://s3.amazonaws.com/bokelur/vegosawid.pdf
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_bc9fb01fc0e94fffa2485e547ddf3dbd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8dbda7ea-0aac-45f9-b313-b26b577eb0ba/jefisobusagaluf.pdf
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_5d1079bdd88f4aefaf234c4e71a2e4df.pdf?index=true
    • https://s3.amazonaws.com/widofafane/how_to_reset_fitbit_versa_lite_when_screen_is_black.pdf
    • https://uploads.strikinglycdn.com/files/9727e2c3-7439-44d0-ac09-703538551e9f/how_much_is_2016_lexus_gx_460.pdf
    • https://s3.amazonaws.com/savukojubusum/porter_cable_6902_plunge_base.pdf
    • https://uploads.strikinglycdn.com/files/5bdbbac2-566b-42c0-a245-f66ada5752a1/93998339566.pdf
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_727ebceb2d144d9d9f36f8fa7eb90e2d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9fe59824-07b6-4c07-9fbe-301e1d372a04/68300779848.pdf
    • https://uploads.strikinglycdn.com/files/d5aa2dcb-3a97-4c57-adc3-a94d0545eb98/69820951139.pdf
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_34ac9d5705604d7483de692850bd81c2.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed43.bin
b6468fd99bde3b369b17ab530071a18581387e167d2272e954e57c98ec9e252a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED43 5380 bytes
font_01_sfnt_off0000ff88.bin
772532e3aa6b12709df7fc98e35c832885124f7cc6cf80ee7fa97092891bb9d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF88 10708 bytes

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