Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de5bf7d67297c91…

MALICIOUS

PDF

94.9 KB Created: 2021-03-18 08:42:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c722f1442197b515df1b8396f2e7664a SHA-1: e7bcc8d0b14255a024ddb90cc77b91727a248c70 SHA-256: 5de5bf7d67297c912c82a2eac7d905c98d142b0a6e23bcb68e35d4afe4caca20
164 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, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many of which are SEO-themed and point to potentially malicious domains, suggesting a link farm or distribution network. The presence of an embedded URL that appears to be a search query for a book further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=revolution+2020+book+pdf+free+download+in+hindi
    • https://dikuzimomufadel.weebly.com/uploads/1/3/1/3/131383892/zibup-titovemeze.pdf
    • https://webegerux.weebly.com/uploads/1/3/4/7/134759049/newawadisava-tululebekanos.pdf
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/kuwupebul.pdf
    • https://begafirezudafo.weebly.com/uploads/1/3/1/4/131438667/likikuremesolob_pakutat.pdf
    • http://werewov.22web.org/amyloid_peptide_formation.pdf
    • http://fedorahosted.org/lohit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d431b647-b69c-4187-937b-9b54cb3efff5/ley_de_educacin_del_estado_de_puebla_2020.pdf
    • https://uploads.strikinglycdn.com/files/df0d4793-43ba-45ee-907d-21d5415ae2cc/cuisinart_single_serve_coffee_maker_ss10_manual.pdf
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_e6ba08c1bd7d457b89e7eade566fbcf2.pdf?index=true
    • http://tujefozumuresul.epizy.com/83541732853.pdf
    • https://uploads.strikinglycdn.com/files/3cdc4a9e-e1c9-4f64-9025-e84ed307140c/brother_hl-2270dw_reset_toner_counter.pdf
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_b56f9fd3b7514ed5a0f4d77f70f2313b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/376f6b25-9b50-4eaa-bc9c-5ad24409688f/netupolalutozowipazov.pdf
    • https://uploads.strikinglycdn.com/files/ee30341d-4715-4a77-96cc-869c5d326cc1/808166053.pdf
    • https://uploads.strikinglycdn.com/files/bdc75e1b-1c16-42fd-b84a-acfaf35f0df8/shadowrun_rpg_maps.pdf
    • https://uploads.strikinglycdn.com/files/e4ed320e-7ba9-4afb-9643-5d6b43e7591a/ford_mustang_ecoboost_price.pdf
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_1d8aa350acda4a5ba574cf076444aae1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f1600332-5e04-46b7-93db-39ff84074110/gomotog.pdf
    • https://uploads.strikinglycdn.com/files/8814deae-0f6a-4e56-8267-0ddcd45a9fd4/echo_gt_225_replacement_head.pdf
    • https://uploads.strikinglycdn.com/files/c7fb86ff-19fc-41b3-abe8-10ea1da73710/zojipekematulev.pdf
    • https://uploads.strikinglycdn.com/files/3925915c-26e6-4ab3-9de9-02d1f90a4733/harry_potter_and_the_half_blood_prince_book_story.pdf
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_ce6f9a1df04c4cafa0025c9869612d3c.pdf?index=true
    • 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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00014ac7.bin
794e330f71f02c83bb7f4373a0fb7dd47c72348d3534a0e7e6cca516ca8391e4
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14AC7 10588 bytes
font_00_sfnt_off0000f148.bin
9fa2c712cab848556cafa03cdaf0b609ab6cfae71fca21b4643eb52a76bedac6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF148 5588 bytes
font_01_sfnt_off0001045b.bin
d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
pdf-font-stream PDF embedded font (sfnt) at offset 0x1045B 3720 bytes
font_02_sfnt_off00010fbe.bin
66a8658696e3b6000c7f4885651f6884231ece04787ebac6d9037ecb324f3c96
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBE 10976 bytes
font_03_sfnt_off0001355c.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15
pdf-font-stream PDF embedded font (sfnt) at offset 0x1355C 16204 bytes