PDF malware analysis — malicious · f1bdb90944302513

MALICIOUS

PDF

85.6 KB Created: 2021-07-15 11:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 1b070f6d6ff1acf62cf1cb58a750aa83 SHA-1: 5b4eb32f11ce9ab90c4f605f5d2db979590553b1 SHA-256: f1bdb90944302513ac9c1ec5d265750a774803274c2ec5e6d5576f07ec937f83

136 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating phishing and potential trojan behavior. It contains an embedded URI that functions as an SEO redirector, likely intended to lead users to a phishing site under the guise of a free download. No scripts were extracted, but the PDF structure and heuristics strongly suggest a phishing attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

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://feedproxy.google.com/~r/sq/ugae/~3/ZFaGRQ6RLlg/square?utm_term=what+is+conservative+force+in+physics PDF link annotation
- https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e94b7883ae0c49023a6b3f/1625901944269/commercial_building_construction_project_report.pdfIn PDF document text
- https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60efd908161c066054364d66/1626331400282/33796007669.pdfIn PDF document text
- https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec86cb7e5cd11affcd87d9/1626113739604/fallout_76_classical_radio_playlist.pdfIn PDF document text
- https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7d36e4d2175279d131ceb/1625805678258/neon_text_after_effects_template_free_download.pdfIn PDF document text
- https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60eff66f1a40e71890516c27/1626338927783/different_2k21_builds.pdfIn PDF document text
- https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60edf7243be50f2c5db043fe/1626208036165/the_seven_percent_solution.pdfIn PDF document text
- https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee471b33d4654651be1cd2/1626228507216/quantitative_observation_meaning_in_science.pdfIn PDF document text
- https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60efd24d34da7a51e3f222b9/1626329677364/spread_betting_forex.pdfIn PDF document text
- https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ededa13e0111437129edc1/1626205601260/vokugokilarekepejejosanil.pdfIn PDF document text
- https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee580277e2cd4113f1b9c3/1626232834968/pekavigewadifetaxel.pdfIn PDF document text
- https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec860fa1f8f93f64ac0bff/1626113551170/burikixukuteworaxopewefez.pdfIn PDF document text
- https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e915d1b68d8f0f4bf7c829/1625888209448/84864954371.pdfIn PDF document text
- https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e943541448b06198498459/1625899860320/fojidanumeri.pdfIn PDF document text
- https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec8247e64ce5371634aab6/1626112583478/design_guide_for_reinforced_concrete_diaphragms.pdfIn PDF document text
- https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8b14bf0e3534f504b4ba6/1625862475467/manual_muscle_testing_knee_flexion.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ebd5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEBD5	17136 bytes
SHA-256: `21ec7f5ec1897c217e636f4870de09d775376d69a0db091fc94fc7a6a590c5a7`
`font_01_sfnt_off000118e4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x118E4	10704 bytes
SHA-256: `ff308b10ed4c923df23c7268b78dfe180f00a98f935ddaf6d20b378ffc8fae09`
`font_02_sfnt_off00013181.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13181	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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