Malicious PDF — malware analysis report

Static analysis result for SHA-256 e813bc0ac47a1e3e…

MALICIOUS

PDF

84.5 KB Created: 2021-03-26 08:38:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a18917e116119cc471510f45df9b82b0 SHA-1: 48bb37c0fc33086c6f8752e71d0bdd1d03d57555 SHA-256: e813bc0ac47a1e3e36f2084eb43a4fe3382f6c9dd53cba2df20336a7e1f86f62
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. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The primary malicious URL identified is https://soxebez.ru/wix?keyword=ap+physics+1+essentials+an+aplusphysics+guide+pdf, which is likely used to distribute further malicious content or phish for information. No scripts were extracted, but the PDF structure itself is indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://soxebez.ru/wix?keyword=ap+physics+1+essentials+an+aplusphysics+guide+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367674/normal_5fdebea724c4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424646/normal_600eb29d6ab0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426260/normal_5ff2d4ed82912.pdfIn PDF document text
    • http://mewanomape.iblogger.org/how_to_change_transparent_background_to_white_photoshop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450512/normal_5ff278222e981.pdfIn PDF document text
    • http://tewajaz.iblogger.org/athens_airport_map.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4949b0a2-6699-4d1f-9082-e1fb02d686db/rotumuvimawitijukuwij.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/can_i_do_python_programming_on_android.pdfIn PDF document text
    • http://wofevumovef.epizy.com/writing_meaning_in_tagalog.pdfIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_3dbe120988f94e4abbbd560820090f9c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2682c442-61c4-4324-b1b1-013a62f28a93/what_is_communication_skills_in_medical_students.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39bf1a79-b84c-47be-b287-06481bb10d63/importance_of_college_education_articles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f210ea1-c4d7-4852-a6e5-489663aedc1a/kabenag.pdfIn PDF document text
    • http://lowavizoviwu.epizy.com/46174312691.pdfIn PDF document text
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_f47f045618e94f219c3625ff3aa83863.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f868c86-f892-4fee-b61b-51c7439c9111/where_can_i_download_microsoft_access_for_free.pdfIn PDF document text
    • http://lanelezezon.rf.gd/51499485263.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cafd173a-b49a-470b-8add-a491a0df1213/fallout_4_map_size_vs_gta_5.pdfIn PDF document text
    • https://198d5876-2e36-4a54-a59d-b4c1060b65be.filesusr.com/ugd/4733ca_c7102360637541679c53834a6ac24193.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/punurum/52649781858.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/xomalizumug.pdfIn PDF document text
    • https://62dace35-232c-43a2-b3e8-6cf19ad57148.filesusr.com/ugd/42ae31_5681a7990a784b34b0625ee54fe5a793.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/320003c9-2438-40df-a179-d239dfa10e9e/xenajupetezejazepoxikage.pdfIn PDF document text
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_6fc8e4d8209c4460a2764d91fe430196.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDB 5236 bytes
SHA-256: 1e16e1a649c88cc667b8f1adc2c494a7f905e31fa7c01cfd9156209a31b38572
font_01_sfnt_off00010db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB3 11724 bytes
SHA-256: 73909e168367cb20e201bf5504b87d85b9e23aeab66c0efc95b44887a53b2ee9
font_02_sfnt_off000135a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A1 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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