Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b9776066c8a4c39…

MALICIOUS

PDF

85.9 KB Created: 2021-03-17 02:47:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b2a7308d7943e21ff8ed775652cb0e6 SHA-1: d2470eaaa2990285e6ba4485baaf3de6dbc8ade1 SHA-256: 7b9776066c8a4c397fe2c24580c161e104e1c1951bacb429f7493f656bb882d1
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a "PDF_SEO_LINK_FARM" containing 30 links. One of the primary URLs, 'https://gimoguvi.ru/award?keyword=ct+brain+anatomy+radiology+pdf', suggests a lure related to medical imaging search results. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the extensive link farm points to a coordinated effort to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://gimoguvi.ru/award?keyword=ct+brain+anatomy+radiology+pdf
    • https://cdn.sqhk.co/pasivuzuke/GicZNgf/rolling_sky_bonus_38_soundtrack.pdf
    • http://fakexexu.sportsontheweb.net/kevikutejuboxapowek.pdf
    • https://genepuxomo.weebly.com/uploads/1/3/6/0/136053587/lapumesixebalapokaba.pdf
    • https://baseparefawufif.weebly.com/uploads/1/3/1/4/131453046/biliboginusorisu.pdf
    • https://gepekipaw.weebly.com/uploads/1/3/5/3/135304147/3232006.pdf
    • https://rozenawaxu.weebly.com/uploads/1/3/4/5/134517597/e4e0b.pdf
    • https://mafexanilexa.weebly.com/uploads/1/3/0/7/130739060/logolatuvupo-dimefika-rokozowi.pdf
    • http://rawoxaxevog.mygamesonline.org/77941284466.pdf
    • https://cdn.sqhk.co/xoresarib/cTWALOU/fortnite_black_hole_mini_game_code_ps4.pdf
    • https://pelozaxuji.weebly.com/uploads/1/3/2/6/132680784/f62ab9332a.pdf
    • https://cdn.sqhk.co/bilexodofose/fI3ghfK/78184900113.pdf
    • https://litusavetedi.weebly.com/uploads/1/3/4/4/134445261/999298.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xenexafa.myartsonline.com/satetutezi.pdf
    • https://uploads.strikinglycdn.com/files/3d946a7b-797c-4030-a776-44ad8fa74e95/papafawoge.pdf
    • https://s3.amazonaws.com/jenisozazewubo/new_bangla_album_song_free.pdf
    • https://s3.amazonaws.com/divexikav/divazepunisujitero.pdf
    • https://s3.amazonaws.com/mexijegedakol/2018_ferrari_california_0-60.pdf
    • https://s3.amazonaws.com/gonasidupij/eclipse_mp3_download_free_music.pdf
    • https://uploads.strikinglycdn.com/files/61f91ce6-a7b8-406a-b401-c813e8f4f225/10494146578.pdf
    • https://s3.amazonaws.com/sinamozagemoger/glencoe_mcgraw_hill_geometry_textbook_answers.pdf
    • https://uploads.strikinglycdn.com/files/be41099b-703a-44cd-816c-f478064b10e7/wologed.pdf
    • https://uploads.strikinglycdn.com/files/99a24a2c-7feb-4b4f-aee4-3bac50b2deba/is_model_3_better_than_model_s.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001154a.bin
6f1864b68da907fbe6bf369cb96ad58fb23b681af5d79758444a39abed28b790		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1154A 5328 bytes
font_01_sfnt_off00012759.bin
d7bdce2e354ddccad3d8a00f5ec9cee0b9fcf2b202be21aa46a42a2442e837b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12759 10176 bytes

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