Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f1722e7a81d2ae…

MALICIOUS

PDF

75.6 KB Created: 2021-04-01 04:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78ac5c6da873e5aeac4c0bfce702703f SHA-1: 9e70946a22308bb9903d66a57ab47e87345d808b SHA-256: d8f1722e7a81d2ae6b19a567ffe6ccf366f2965738b8961be6b990784f72a63c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms or phishing lures. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to drive traffic to potentially malicious sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. While no scripts were directly extracted, the embedded URLs are the primary indicators of compromise.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crophysi.ru/123?utm_term=pdf+file+online+open
    • https://cdn.sqhk.co/jagawubu/bifgdIs/59574326748.pdf
    • https://cdn.sqhk.co/xawefigi/FskmhgL/teximelovuvabogotifijiwe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bimegisekew.epizy.com/sukamerajebi.pdf
    • http://zaxisomal.epizy.com/arginina_vasopresina.pdf
    • https://uploads.strikinglycdn.com/files/4442c532-fb2c-49ee-976c-fb5db249c2a2/us_history_shorts_the_colonists_unite.pdf
    • https://ac65beef-1c88-4b01-a948-251493ed82f2.filesusr.com/ugd/09857b_f45b70abc443409f84441883b975d3f0.pdf?index=true
    • https://141ebdc9-a3c9-4c6d-b8f9-366dbf139dec.filesusr.com/ugd/46bfb0_22cd57a373af4746ae8f511cebd69db9.pdf?index=true
    • http://nunowezowijoper.rf.gd/93610001432.pdf
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_eef4191d719c497292169b5f8023425f.pdf?index=true
    • https://cfc603e6-7cd4-4c42-812b-9722deb80ae4.filesusr.com/ugd/0e9fc2_f5349fa22d6544b49ee9cb2337fbe4cd.pdf?index=true
    • http://fevejalamozek.epizy.com/vezikolivetidi.pdf
    • https://uploads.strikinglycdn.com/files/1afee48b-4b05-4981-b42d-83c0172ae404/39335450567.pdf
    • http://remigesej.epizy.com/buzamexemowebajavosibug.pdf
    • https://178c1879-e916-404b-9861-a2431bd0f83a.filesusr.com/ugd/1aace6_a0ad66f37b274f568ab6e5d8259daf4a.pdf?index=true
    • http://teruwisap.epizy.com/gidenulekepu.pdf
    • http://boxitevu.rf.gd/97621147955.pdf
    • http://pimudovi.epizy.com/bootstrap_3_horizontal_form_multiple_columns.pdf
    • https://11fe2947-f393-4df3-905d-f9f3730e834a.filesusr.com/ugd/b1b16e_822944f21ac84da7b0ce8802136bf7e0.pdf?index=true
    • http://sizokipizap.rf.gd/assignment_problem_in_linear_programming.pdf
    • http://molojagevatabu.rf.gd/nice_guidelines_stroke_prevention.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed15.bin
5ed5c2f6ced4adaabc7e432d7aaaa6ee6e7eb12f243db6e1ee133605c8fb02f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED15 4552 bytes
font_01_sfnt_off0000fcaa.bin
d96570b48944f0ced4e96279267436177cf8fcaf9125e1aaabcde5ee4cd35a25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAA 10564 bytes

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