Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1c786fbcd145784…

MALICIOUS

PDF

75.1 KB Created: 2021-07-12 22:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: bcac982bbe188d916f4b3abfaf328072 SHA-1: 62fbc7cf325ba1447068835e47384941deee40c2 SHA-256: d1c786fbcd145784278b7f3a54763af98848ddd18ccd00faed0c769df6de7a94
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains heuristics indicating it is a phishing lure, utilizing an image to redirect users to a URL. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing campaign aiming to trick users into downloading further content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9163

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://feedproxy.google.com/~r/sq/ugae/~3/aauXj3bnHUA/square?utm_term=100+divided+by+40 PDF link annotation
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8fab218245d33f18022ce/1625881266371/puzzling_questions_with_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e785304130bb3e8e25aec3/1625785648705/40087104184.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8f1da3f195e1e40343d8b/1625879002997/molal_depression_constant_of_water_is_1.86.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e827c04b964f05b84b1ebf/1625827264807/lsa_airplanes_for_sale.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec87667a1add4dee1fdef9/1626113894393/212_f_to_c.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec787bc268f363b085a3bc/1626110075308/nofigokeba.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e945a52dabf272355586b5/1625900453674/zopuxifabepoxoridatilewo.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC928 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13E 9916 bytes
SHA-256: ef9059859764316047fcc06156da9027c50c023165cc2b5812b325ee2105b55f
font_02_sfnt_off0000f73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73F 16064 bytes
SHA-256: 254f08ab9488683a5b9b0ef26e15315e1c2079997da6ae2a5293d564839e3c88

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