Malicious PDF — malware analysis report

Static analysis result for SHA-256 6af16e926513f208…

MALICIOUS

PDF

126.7 KB Created: 2021-04-13 15:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2bb9836650b38f65b7286a1b8e3bb559 SHA-1: ee4c524ef3f9d2f4f85fcc4f50837c9a7f83d927 SHA-256: 6af16e926513f20892c7f4f8895c24e9002e858e303a264ca8f3d321746113a4
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, including one that appears to be a phishing lure related to search terms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9891

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/strik?utm_term=unravel+definition+synonyms+and+antonyms PDF link annotation
    • https://cdn.sqhk.co/gukawaki/icAheXj/nivoxi.pdfIn PDF document text
    • http://vodizurulenega.mypressonline.com/jurassic_park_theme_song_sheet_music.pdfIn PDF document text
    • http://jalosus.mygamesonline.org/accessible_tourism.pdfIn PDF document text
    • http://goodsun.fun/soxijiskasy.pdfIn PDF document text
    • http://firstsecu-paypal.com/how_to_reset_actiontec_router_passwordp8k5m.pdfIn PDF document text
    • http://tipaxoj.66ghz.com/android_bottomnavigationview_change_icon_color.pdfIn PDF document text
    • http://argo-tourism.com/research_paper_example_high_school9aeqr.pdfIn PDF document text
    • http://cancandance.org/maternity_leave_south_africa_2019_forms33e90.pdfIn PDF document text
    • https://cdn.sqhk.co/xaselavub/jfQgje5/80608905301.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/lulelepese/estimating_decimals_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/8221942611.pdfIn PDF document text
    • http://wotawegij.rf.gd/tidufikurafado.pdfIn PDF document text
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_fd8fc7feb0944c53aa07359177b1b5e3.pdf?index=trueIn PDF document text
    • http://tepisivud.epizy.com/swan_lake_violin_sheet_music_fiddlerman.pdfIn PDF document text
    • http://jofeliruf.rf.gd/66107535192.pdfIn PDF document text
    • https://bf2b7b75-7790-49a7-81e6-d2546e692b42.filesusr.com/ugd/8ccf63_a418d3d922e64e5b92408bf8519f4c3b.pdf?index=trueIn PDF document text
    • https://a1d1c4ac-cf1d-4c58-861c-45d1188f4b60.filesusr.com/ugd/052f3a_2517050a16e24a24a3a5b8b5bc5acadf.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_009_off0001af6d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1AF6D 25088 bytes
SHA-256: cf952ef607e4dd08d8e100d79f2f3a29b7cf7b0089d1489815a3cf1db514f86d
font_00_sfnt_off00010c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4C 10760 bytes
SHA-256: 566f967e3c86289eda48c1fe1fddd94cae4e3e2c85a56fc167dabfe0cb352b17
font_01_sfnt_off0001304b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304B 5204 bytes
SHA-256: 48bf2d9bd96705b352dd69cb1139ce0fba938a53ff405aa5e36316780ea0a28e
font_02_sfnt_off000141f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141F7 2976 bytes
SHA-256: 94a752f2cccf7de89d518ede7d68551e8dae397606722a72215c015780a3278f
font_03_sfnt_off00014dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DEE 4484 bytes
SHA-256: 73ad940f9a4ef098f1bf2662c3fdf3aa1bfac2a854fedf27a263cb238d96b881
font_04_sfnt_off00015c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C5B 7180 bytes
SHA-256: 0f7ea58f6834f6f4d320b79786d07fd43ecc4ac8d8b2ee7384925798bcacde04
font_05_sfnt_off00016fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FBC 22812 bytes
SHA-256: 0c06de0610fd1f101b336e35fc3a0adf381a7268c0fe40740bef228eba93325e
font_07_sfnt_off0001dae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DAE1 4236 bytes
SHA-256: 16b6fa1e973a91160c8578ebbf5e3df2cf7d9e1173be37b3691baebe6a00e3a9

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