Malicious PDF — malware analysis report

Static analysis result for SHA-256 82bc335e70e1fb07…

MALICIOUS

PDF

102.7 KB Created: 2021-04-07 03:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25ed78da537fb5633f86bc307050b2d4 SHA-1: 2009b100f64e0b63146d0902eeeffcb92ee4edfb SHA-256: 82bc335e70e1fb07c39ddc8c78373aa530e5dbe93aecb73c48eef8e691de6ced
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, flagged as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary links points to 'resalured.ru', which is suspicious. The ClamAV detection and ML classifier also indicate maliciousness, suggesting this PDF is designed to redirect users to potentially harmful sites, possibly for phishing or malware distribution. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://resalured.ru/123?utm_term=black+desert+ps4+node+guide
    • http://wigisosidika.22web.org/aprendizagem_e_performance_motora_download.pdf
    • https://cdn-cms.f-static.net/uploads/4371247/normal_606b924e974be.pdf
    • https://cdn.sqhk.co/vosiwuli/ojhig1I/sirocco_boat_cost.pdf
    • http://nejupike.mygamesonline.org/60215548087.pdf
    • http://rolorutebu.sportsontheweb.net/bissell_proheat_repair.pdf
    • http://wenatal.getenjoyment.net/bagging_machine_learning.pdf
    • https://static.s123-cdn-static.com/uploads/4451350/normal_60057ff61da9b.pdf
    • https://cdn.sqhk.co/wifepodilojo/kRBFjcQ/nojifexujuzugibozezilafuz.pdf
    • https://cdn.sqhk.co/kupujape/cFggjfZ/34188420581.pdf
    • https://cdn.sqhk.co/boxepupovemu/fiVpqml/konobifomokaw.pdf
    • https://cdn-cms.f-static.net/uploads/4415944/normal_601b2b6fe8bb2.pdf
    • https://static.s123-cdn-static.com/uploads/4470552/normal_5fdd7fa64bcea.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_20a8b4c409ee4b709efa79cff8e8ba70.pdf?index=true
    • https://520c840f-7702-4e28-87de-278da5b03b63.filesusr.com/ugd/e633b3_fc9849a868904973a11cc3783f89d229.pdf?index=true
    • https://6129906d-bc82-46a7-99f5-71793a58af3c.filesusr.com/ugd/d162e3_004a46b6b4784838be88070f73d045c5.pdf?index=true
    • http://biborufa.epizy.com/jupiter_ccell_palm_user_manual.pdf
    • http://gewopebij.epizy.com/zutudopejuduwepananud.pdf
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_db732c5a120c476b8d2ecdc84aa91815.pdf?index=true
    • https://4c69d07c-928c-405f-a1ab-6436392658c4.filesusr.com/ugd/4c264d_4d6f2ca14829493ca39629dae27596a0.pdf?index=true
    • http://puwegobatove.epizy.com/atonia_uterina_signos_y_sintomas.pdf
    • http://nibudikugi.epizy.com/38729020697.pdf
    • https://3bdad275-8828-414d-9063-9532e035d791.filesusr.com/ugd/c67d0c_2ca99eafcf894fd298ff65af9986ea0f.pdf?index=true
    • https://7e079b21-6cfc-4bbc-a8af-001f4930a7f2.filesusr.com/ugd/f66805_a6ab2f2dc058466980d0128308be4b93.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001346a.bin
f36a962404e4c6cf638383fc9477a0a5c125a7fe856dbfefa9a0360a63fa6402		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1346A 5444 bytes
font_01_sfnt_off000146fe.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x146FE 1800 bytes
font_02_sfnt_off00014f8b.bin
ed4ce7c708dd2a1a4858a2abbe76c96651e9c01f3917091181bb3fd0aebb457e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F8B 11556 bytes
font_03_sfnt_off00017715.bin
975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17715 16312 bytes

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