Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bd76630dd2dac44…

MALICIOUS

PDF

76.5 KB Created: 2021-05-11 20:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 569759c2aedcd8466280607c1857093c SHA-1: b09dae2f6c44cd066d4520ac16001881b830c514 SHA-256: 6bd76630dd2dac443644d5ff840af00e9ff4b0f7c7375020d1859149cb975c9f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, indicating a link farm likely used for SEO poisoning or to distribute malicious content. The document body, though truncated, references a sewing machine manual, suggesting a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8400

Heuristics 6

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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 http://riwozizedilar.mygamesonline.org/bescherelle_francais.pdf
    • https://vavaxomutiposev.weebly.com/uploads/1/3/0/7/130738712/6231214.pdf
    • http://twirlini.com/zifurefebuj6x9a.pdf
    • http://wewudiwiwojob.22web.org/alesis_sr_16_drum_machine.pdf
    • https://rinuvimasajef.weebly.com/uploads/1/3/2/6/132695862/fozewotofe-zatod.pdf
    • https://xuwixozewinufub.weebly.com/uploads/1/3/4/7/134702679/kuxuxufivota_zuvebeb_nimuveseg.pdf
    • http://lngcliente.com/eternal_card_game_budget_decks77q1m.pdf
    • https://nometoxuf.weebly.com/uploads/1/3/4/2/134266561/6b9988.pdf
    • https://parexuboruz.weebly.com/uploads/1/3/6/0/136089541/aa45f8f1ff3fdb.pdf
    • http://alcozerox.com/c_sharp_programming_books_in_hindi2wjhk.pdf
    • http://nibewubixela.getenjoyment.net/zipod.pdf
    • http://bapexuwepurisig.22web.org/chest_af_guidelines_2018.pdf
    • http://gufutaca1.xyz/5261521636xi8xo.pdf
    • http://top-agent.ru/11236503525phvg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/_7yJ53orglQ/wb?keyword=singer%205830c%20sewing%20machine%20instruction%20manual
    • http://josesomesube.myartsonline.com/kelimpahan_gastropoda.pdf
    • https://uploads.strikinglycdn.com/files/3ac63dd4-109a-429c-a021-175528b5d77b/the_lord_of_the_rings_full_movie_download_in_tamil_isaimini.pdf
    • https://uploads.strikinglycdn.com/files/b3188c04-9992-463a-8515-e26f5b1d9e5f/which_software_should_i_use_for_c_programming.pdf
    • https://e26dc784-fa46-4601-9f6d-57686faaf216.filesusr.com/ugd/c66525_163f65ffc2984d3bb8d31486ea4c6792.pdf?index=true
    • http://paguxesij.myartsonline.com/el_abecedario_en_ingles_y_espaol.pdf
    • https://cc4f1b1a-08c7-467e-bb5a-e3073ad8caf1.filesusr.com/ugd/ffc175_723b8f9665694ad08dbdb9a080a9bf28.pdf?index=true
    • https://87d5e434-dc39-4d64-8681-877d64e204d5.filesusr.com/ugd/5660ac_73de0906eadf4d79a873f1f4af7ae674.pdf?index=true
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_3d18c70e6a3b49fca3443c5204e6c2f8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b190df02-76a1-4bcf-99af-a5b0b4cdd880/zidizofumanitugu.pdf
    • http://bunizavax.rf.gd/mogapivomazegisenezop.pdf
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_44de88145b6a404aadc5a87c91accd83.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f864.bin
66c060cb25b680f9c4ac4b81960be429928d3ed9ad72aeb67d9163465ea35b8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF864 6032 bytes
font_01_sfnt_off00010cd6.bin
f679941a921da34bc24430488d11be27bdf6da10a345ba3703ae66374ffbcea0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD6 10608 bytes

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