Malicious PDF — malware analysis report

Static analysis result for SHA-256 537a02b9c1b72430…

MALICIOUS

PDF

162.4 KB Created: 2021-03-24 12:44:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 753953731a97e492abe84a22df90578e SHA-1: 72567edfa92324e9416b0011cc8964cb87cb89ae SHA-256: 537a02b9c1b724309c564464fffc00f411c8d9c298716dac4d6f691a1bb8e2df
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it contains an external URI and an SEO redirector link. The document body, though partially corrupted, contains keywords related to 'pokemon heart gold emulator cheats', suggesting a lure for a phishing or malware download. The primary IOC is the malicious URL used in the redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://baarspo.ru/wix?keyword=pokemon+heart+gold+emulator+desmume+cheats PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485176/normal_601f318d12cd3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414502/normal_5fed34e581c9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446388/normal_5fedbb4ad0873.pdfIn PDF document text
    • http://se-mrush.com/2008_chevy_malibu_maintenance_schedule4v7ij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490534/normal_605af7aa76002.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380682/normal_5fcf3f9c14c4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476274/normal_605021b79568e.pdfIn PDF document text
    • http://italiahot.space/714588069ggd9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403140/normal_5fdc24c6073bd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dea79ad-6404-4ef1-ba62-b9542df3cdca/how_to_clean_filter_on_bosch_serie_6_washing_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/little_alchemy_2_guide_plant.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/base64url_encode_android.pdfIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/98597798857.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/844b4d24-e0dd-4083-9ce7-dc755ba4f8f5/arifureta_shokugyou_de_sekai_saikyou_light_novel_volume_3_illustrations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9120083e-ffe1-4722-8bd3-5c454f3cac66/55931085054.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/tavifumidulitave.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/bully_anniversary_edition_revdl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eecf70ee-95e5-4aa8-a771-ccb4c0aa7642/false_god_4_letters_crossword.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/shin_chan_episodes_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/30387836881.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/bb_racing_blitz_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/student_finance_wales_course_abroad_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed2e28b9-15ec-4c9e-a315-879009424a02/how_to_write_a_paragraph_3rd_grade.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_off00023f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23F25 5420 bytes
SHA-256: a8038dd7b0fd8399e7938ada047b7e628b4422626b385025026a985cc6a0f376
font_01_sfnt_off0002516d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2516D 12024 bytes
SHA-256: 02490f75add494b9094929db796f17deddcb9a0692946e830c0dbc7b77ef0cd5

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