Malicious PDF — malware analysis report

Static analysis result for SHA-256 44e606c7c7abab39…

MALICIOUS

PDF

70.2 KB Created: 2021-03-20 04:26:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 486ca23fe37f06c4d0124d1c1573adf8 SHA-1: 314acae92df047cbef46b466f693edff6118e609 SHA-256: 44e606c7c7abab3936e38c4113b2089ce12fdf76bd2ee0258c0595fc07301ae7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to artificially inflate search engine rankings. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/award?keyword=hex+cable+gland+catalogue+pdf
    • http://gazozaxuk.getenjoyment.net/pendidikan_agama_islam_kelas_x_kurikulum_2020.pdf
    • https://wetusaseri.weebly.com/uploads/1/3/5/2/135297966/besiviwov_bewofox.pdf
    • https://buxodofuluni.weebly.com/uploads/1/3/4/8/134875319/nijuvawasivowe.pdf
    • http://ogranicbio.fun/surofofumolokitcm29d.pdf
    • http://flash-sar.online/marksheet_number_mumbai_universityskeam.pdf
    • http://idealslimitaly-official.site/fubijupewadonibolagatkh4s.pdf
    • http://pifofobexaxel.mypressonline.com/cours_d_anglais_grammaire_gratuit.pdf
    • https://zokilare.weebly.com/uploads/1/3/4/7/134767859/3c795b04fb1fe68.pdf
    • http://vostokzapad.su/wings_and_things_near_escondido_ca07c10.pdf
    • http://lugabev.mygamesonline.org/peg_perego_primo_viaggio_4-35_cleaning_instructions.pdf
    • http://lezigovedavide.getenjoyment.net/kinebisofav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jitimesolagun/anatomy_of_story_truby.pdf
    • https://933afb0c-60ca-4ff4-ba38-e7c804ca925d.filesusr.com/ugd/941881_bbc000ff3c0d4ca2899449c1f22f4bf3.pdf?index=true
    • https://s3.amazonaws.com/xapijifas/my_cloud_os_5_installieren.pdf
    • https://s3.amazonaws.com/falufusu/42494643368.pdf
    • https://s3.amazonaws.com/safago/background_check_release_form_template.pdf
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_6f2d66af615344c1beea3ec2524aca2e.pdf?index=true
    • https://s3.amazonaws.com/zibenoroduzuw/free_blog_website_templates_html.pdf
    • https://ac25a69f-a984-4293-9c3d-8c9e0f062535.filesusr.com/ugd/cbf077_35f5adc6c6ab4d45ad9916c0fea49407.pdf?index=true
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_c93849d06378427e906954085e082b9d.pdf?index=true
    • https://s3.amazonaws.com/bamepofewalada/gemadilenonoxubawisil.pdf
    • https://s3.amazonaws.com/joterige/scrabble_word_finder_game.pdf
    • https://s3.amazonaws.com/mibiwivanetuj/existence_crossword_answer.pdf
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_95f2a13be56d46e3a9a2cb4308599544.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_off0000d4ed.bin
df6fe163eba0e69fae3cb6788e3f5058f5c6db65c6a2114ec5bb538da1cd1e9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4ED 5216 bytes
font_01_sfnt_off0000e6c2.bin
3edf0e6dde07f2d9eac9ea3832f91043961222054c7bba26f2109468dfd0e81d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C2 10256 bytes

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