Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf2e5b7d14fb0d4d…

MALICIOUS

PDF

94.4 KB Created: 2021-03-13 13:30:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a7c42fe34459577dff61ada4f5f2730 SHA-1: 563150e7e8be53d0c41f27158aba6a9490ef0c28 SHA-256: bf2e5b7d14fb0d4d1c7c886d9d2538f9b10f6a7fdaeb28cc746d8f9533abd602
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm with numerous external PDF links. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', suggesting it was generated programmatically. The presence of many unknown reputation URLs, particularly those associated with the link farm heuristic, indicates a high likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://vilenefex.ru/123?utm_term=gloria+estefan+conga+sheet+music+piano
    • http://poxexududojal.66ghz.com/comma_splice_grammar_worksheet.pdf
    • http://xojetupamowub.iblogger.org/215_guideboard_rd_halfmoon_ny_us_12065.pdf
    • http://lazujifoxupa.getenjoyment.net/40132499841.pdf
    • http://puxeguka.iblogger.org/provisional_admission_letter_format.pdf
    • http://zunuruxeguxifi.mygamesonline.org/why_doesnt_she_answer_my_calls.pdf
    • http://piwulag.sportsontheweb.net/3697412407.pdf
    • http://rixorevu.getenjoyment.net/dupumuxanuvorelozosewo.pdf
    • http://susobokilodos.iblogger.org/kunasazukekisanabuf.pdf
    • http://vajogeboru.iblogger.org/fudomatewa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b56a2dfa-6c88-4057-9a7d-b3001f7fd957/the_school_by_donald_barthelme_analysis.pdf
    • https://58f604bd-1fd8-4cfe-af9b-f15e67d030d5.filesusr.com/ugd/9a7439_32b73f935b1942578bd3075a747a771a.pdf?index=true
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_2caed571c073438cba4b88dcccec18fc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f14bbcf6-7895-48b3-9ebe-d99415251fcf/magnum_x5_airless_paint_sprayer_parts.pdf
    • https://f00dc01c-b9cd-4c7c-921e-6bd37cbb77f8.filesusr.com/ugd/c068f8_8ce3a94cde914a4c8559ff0dd85784e0.pdf?index=true
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_740d88265abd46dfb1a4845129008f9b.pdf?index=true
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_4dbdce87c2aa4455800c8c1920a3e617.pdf?index=true
    • https://6d8b2927-5c4d-40df-b593-c6bd35e19528.filesusr.com/ugd/1adac8_0e770aeed2634bd6a29264899ffea6cf.pdf?index=true
    • https://uploads.strikinglycdn.com/files/15a91dc7-e7fa-485d-b01a-c70fa98d868e/pitalulisapas.pdf
    • https://uploads.strikinglycdn.com/files/980588ca-e115-49e5-9881-2df2d7f57c35/what_is_the_four_source_theory.pdf
    • http://derasowuras.epizy.com/aupcharik_anopcharik_patra_format.pdf
    • https://34e2f0dc-0077-42bd-a047-efa2502e92af.filesusr.com/ugd/8a05ec_6dc6026fcaea4aab888d9dbfe662001c.pdf?index=true
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_cd780e4a87c449ffaa88f039f65cab81.pdf?index=true
    • https://73099f28-10d5-4558-98a1-2f8dc61f1a2f.filesusr.com/ugd/f62eaa_0d78646d68aa47c2bc1d57f5a70630db.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2f1cb00b-205e-4945-a27d-59086b6784af/lenguaje_del_cuerpo_alexander_lowen.pdf
    • http://vobikeretuwof.atwebpages.com/beamer_includegraphics.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001512b.bin
c3830d45c7a0e25c61aef023116325ae252e84843a8bbea6fef3a24157066d5c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1512B 17848 bytes
font_00_sfnt_off0001155c.bin
fe57251ba0f7fe856b6b69e548992b033d8b5c80a863203c528b51ba403c7209		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1155C 5460 bytes
font_01_sfnt_off000127c5.bin
b5a5c010c836a4517aa2a2187c6666d27613e516445104c1345e9c87c7305bf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127C5 12156 bytes

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