Malicious PDF — malware analysis report

Static analysis result for SHA-256 4245c7038072a91f…

MALICIOUS

PDF

93.9 KB Created: 2021-06-01 07:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09ca0f85c06f3618dc0cc533a499edc9 SHA-1: d8a09173bc3130283aa992db6710d1fd238dffa2 SHA-256: 4245c7038072a91f9b91754f5607af20e79bc3bf996b9dbb975ef018d668ce97
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external links, with one pointing to zajinet.ru. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect users to potentially malicious content or engage in SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wb?keyword=part%20time%20graphic%20design%20jobs%20atlanta
    • https://wupizesave.weebly.com/uploads/1/3/4/5/134581048/8765448.pdf
    • https://xitipirobopu.weebly.com/uploads/1/3/0/8/130813988/kofevejewa-daxufogabogela-dutawosoxazem.pdf
    • https://kabixiwuvilaz.weebly.com/uploads/1/3/2/6/132681231/riselibedejanuwil.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/3f6816dd-0bf3-422c-9d83-4c476be2bf0d/why_is_my_dyson_brush_not_spinning.pdf
    • https://uploads.strikinglycdn.com/files/1a3c7e45-08d9-4d56-ae9b-44da94bbecf6/9066500208.pdf
    • http://xiwitanul.pbworks.com/f/rewrite_the_following_sentences_into_negative_and_interrogative_form.pdf
    • http://naxoxututal.pbworks.com/w/file/fetch/144444126/jezonanamitujefuzipado.pdf
    • http://mikabipi.pbworks.com/f/28093143871.pdf
    • http://nigezid.pbworks.com/w/file/fetch/144424464/lokigowenutusipil.pdf
    • https://uploads.strikinglycdn.com/files/4cae4d1c-3ef3-4d58-801c-fe7c305ffbbe/matlab_optimization_code_examples.pdf
    • https://uploads.strikinglycdn.com/files/42c82dca-ba8e-4133-9411-fa6f971e29b6/25361860395.pdf
    • https://uploads.strikinglycdn.com/files/7c2c7518-6fe4-4332-bb61-a0c6242bc0f1/totofokinojedapemevak.pdf
    • https://uploads.strikinglycdn.com/files/510a5d0e-977b-48b3-bc9a-0ec94583f742/59504878396.pdf
    • https://uploads.strikinglycdn.com/files/cafc3ae8-b464-4a5c-a750-d0f2593992ee/phoenix_zoo_membership_renewal.pdf
    • http://mumubib.pbworks.com/f/14485633926.pdf
    • https://uploads.strikinglycdn.com/files/7037cd47-f541-458f-90e6-89114a7cfa0a/gemedowabejib.pdf
    • http://lekuzax.pbworks.com/w/file/fetch/144418776/how_to_use_chromecast_with_bluetooth.pdf
    • https://uploads.strikinglycdn.com/files/80e0b313-37b4-4eda-995a-1d8f3de71ca0/black_boy_hairstyles_with_hair.pdf
    • https://uploads.strikinglycdn.com/files/8e07700c-0ded-48fc-ba72-ae8903b1e76e/why_distinguish_between_capital_and_revenue_expenditure.pdf
    • http://wefolevemud.pbworks.com/f/nalova.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001224b.bin
dcf7b122c5104ced3c03974c2cb8bb028a421e7d7471b1a0ced198aa8187727b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1224B 5492 bytes
font_01_sfnt_off000134c3.bin
760fb76888f821050996bfa0f655b144acf1cf8f26f35be8d0176f6bb445b1e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134C3 11556 bytes
font_02_sfnt_off00015c5c.bin
ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15C5C 4324 bytes

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