Malicious PDF — malware analysis report

Static analysis result for SHA-256 e43138e6a127fb06…

MALICIOUS

PDF

79.3 KB Created: 2021-03-09 08:04:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: df09fcc8075646c5f951f6a953a98669 SHA-1: e77bd5d65490e455794c67d7a9b8ceeb3bd66380 SHA-256: e43138e6a127fb0636cda4c290beaac267717e1d924adafa047549739455c69a
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting it's part of a link farm designed to drive traffic or host malicious content. The document body, though heavily obfuscated, appears to be a lure related to a Lenovo laptop manual, likely to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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.
  • 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
  • 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://seumenha.ru/wix?keyword=lenovo+g500+laptop+manual PDF link annotation
    • http://lamalegujig.22web.org/grammar_workbook_3rd_grade.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/5b82d155-e836-4635-8c30-7d71be0b813b/tigugo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30a5eb66-b0bf-40ef-bbbf-58cc8bb15fd9/72027825998.pdfIn PDF document text
    • http://zabetexukiked.epizy.com/welimemaj.pdfIn PDF document text
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_9db7cbee6c3342a0969bce00d5471015.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/62645615899.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbad9818-cd3c-4bab-9f9b-a3efba7418f8/how_high_should_my_massage_table_be.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f40d3be-9740-4a36-8b0e-4483af0a29f0/how_much_does_a_used_2015_honda_accord_cost.pdfIn PDF document text
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_8f60e852233d4eff9603236076b86482.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5417d14f-1cdd-45ac-af6f-7b6f0e77f040/40606794591.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd10da95-9da5-47a4-ad2e-49fb9e22d684/xalisuveluxelorukilelij.pdfIn PDF document text
    • https://c5e26362-acc3-4c40-9db4-ce0cbd355080.filesusr.com/ugd/681527_a23b30e526a3431c986a20cb589980c6.pdf?index=trueIn PDF document text
    • https://156bb51f-0b62-477f-88ca-8620af00812b.filesusr.com/ugd/e3ff21_1ef2f99d01784882bee5c702c16a6ae7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/8th_grade_algebra_problems_worksheet.pdfIn PDF document text
    • https://a1359116-1358-4cde-afc5-3600b4bb50db.filesusr.com/ugd/3b0c81_696f06f43ea744d7ae87f64130859b07.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5346e214-b20a-4e9d-b5d9-af7ed0250dd7/old_yeller_book_report.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/benotidifesamu.pdfIn PDF document text
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_3849c88ce685492db5c76bcf849d3b91.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/feliso/does_a_heavier_recoil_spring_reduce_recoil.pdfIn PDF document text
    • http://nukuzuxowilaz.epizy.com/al_nasar_lab_lahore_online_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c719e5b-f07c-4919-bf39-c45e9720c567/john_phillips_commentary_used.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2125ad57-d0b3-4c67-9c89-473bf81ff012/text_message_png_transparent.pdfIn PDF document text
    • https://089130c0-62ae-4bf1-a93c-656440fe8451.filesusr.com/ugd/738632_d4f072208231436ca6d827c2a5c38cd0.pdf?index=trueIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001042d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1042D 23304 bytes
SHA-256: 8dd4cbf7e204a395fc33c933435e1d9833bcf9e7d3a78b1393243572f974e337
font_00_sfnt_off0000ceb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB3 5132 bytes
SHA-256: 307eb00bf40101921c93369e5c1aae6d59b431d74f93f16216ba6ef4d6005dea
font_01_sfnt_off0000e033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE033 10656 bytes
SHA-256: 470318167e7f5606b6c90f3ae0e97cdf9ee940b877d21dd72b7909fa049e10ca

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