Malicious PDF — malware analysis report

Static analysis result for SHA-256 d27a6875f1b628fc…

MALICIOUS

PDF

90.2 KB Created: 2021-07-12 20:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 06c0f87d6086f40e55535aa53ef92a90 SHA-1: 2a02ee7d1aea9964dc76d4822df81a1e5b1c2529 SHA-256: d27a6875f1b628fc62c9faf7a39c763eea4f90e1b54b00c135615145dc9c7ee8
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for an SEO redirector link, specifically pointing to 'https://catamma.ru/square?utm_term=bad+effects+of+social+media+on+youth'. This URL is associated with phishing and malware distribution. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The ML classifier and other heuristics further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8627

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
  • 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://catamma.ru/square?utm_term=bad+effects+of+social+media+on+youth PDF link annotation
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e95a8f6e267257943c89c4/1625905807366/mortgage_by_conditional_sale.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec800add2ac847ff7e4a87/1626112010256/dr_noha_soliman.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e7d357dbc52028c83f3120/1625805655954/west_penn_power_outage.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8f75cfc46b15058264f34/1625880413002/33004738364.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7d7b760c9e2bcf426f08/1626111355540/how_to_slime_without_glue.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e86e1141b5053d864106c7/1625845265643/80498082108.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8a50da68a157289794ad5/1625859341644/13460800501.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

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7F 10908 bytes
SHA-256: edc14b6eca36f0e6fb8b61ceaa147add308cc9f727ebf66699bc003b165209f0
font_01_sfnt_off00011892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11892 16884 bytes
SHA-256: ffbbde3f6bc6fab882a401043f64b522f2472b0c7e499dd6717dc2449a108800
font_02_sfnt_off000144d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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