Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb10cc3ad50f96b…

MALICIOUS

PDF

110.7 KB Created: 2021-03-28 10:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 704c320eb111a97d134aa01525f96ebd SHA-1: d2de2681a689dda748bbe39968d11d7727401792 SHA-256: fdb10cc3ad50f96b9a84aec1fb0dcee2b43658361606a3d59edfb685d3f8c83b
176 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users to potentially harmful websites. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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/award?keyword=byomkesh+bakshi+golpo+pdf
    • http://gufurebu.medianewsonline.com/derivatives_calculus_examples.pdf
    • http://paxenazubenib.mygamesonline.org/6722951682.pdf
    • http://zexaribamemavi.sportsontheweb.net/56674905758.pdf
    • https://kusafulidofet.weebly.com/uploads/1/3/4/0/134017607/bisasinejoduli_tesajavekuko.pdf
    • https://bawovaleza.weebly.com/uploads/1/3/2/6/132683088/nepiru_kirurugosuwufir_dinojelam_vifuxesadebuzuv.pdf
    • http://kimiter.medianewsonline.com/98997339045.pdf
    • http://fofumumitem.medianewsonline.com/chemical_admixtures_concrete.pdf
    • https://cdn.sqhk.co/remozemot/eicihcq/gluing_rc_buggy_tires.pdf
    • http://gixodugesu.medianewsonline.com/mario_vargas_llosa_libros_gratis.pdf
    • http://rinujajija.getenjoyment.net/ruet_admission_circular_2020_18_download.pdf
    • https://sotugenedoximo.weebly.com/uploads/1/3/4/0/134040923/mugetagoruti-gimipe-degeb.pdf
    • https://cdn.sqhk.co/pibilebomek/GnhiHhd/volume_enhancer_app_for_pc.pdf
    • https://fiwisito.weebly.com/uploads/1/3/4/7/134715438/7991117.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://c22e5cf4-338a-4003-9cad-c1cb0be29285.filesusr.com/ugd/3db607_bc99cde20b6d47c9acdc9b27fead7112.pdf?index=true
    • https://e012ec00-e8e8-475f-a96b-80cab2ad705b.filesusr.com/ugd/3f1139_934d5b5ef623400da62565629050f946.pdf?index=true
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_a32c5beb7fa84415ae2b58f31d4895e2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/705bf50f-738f-4661-b2b6-5b468acc3201/johnny_cash_feat._u2-_the_wanderer_lyrics.pdf
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_190a31a81c37494798a58a5aca55c51b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cd703534-c9c8-43f3-8509-901e0a837cbc/pufekewuso.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
    • 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
font_00_sfnt_off00013f93.bin
d176388f44f65d86fc9eb81ce00c862ff72f325266b0c02fcf1259fb92f0775b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F93 5316 bytes
font_01_sfnt_off000151b0.bin
6e48af93e94538258cef6b3fea89450ce7b61293eeae178e7fb8570e726f9c24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x151B0 5072 bytes
font_02_sfnt_off00016204.bin
9630015e9e635f1c6fc0b292318a61843d30aae802feb0637ef7778f0112f85c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16204 11608 bytes
font_03_sfnt_off000189b7.bin
6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x189B7 16164 bytes
font_04_sfnt_off00019ecc.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19ECC 4324 bytes

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