Malicious PDF — malware analysis report

Static analysis result for SHA-256 7df912b9ce60e0ba…

MALICIOUS

PDF

84.0 KB Created: 2021-03-28 07:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91d7a841c94c29d33b71eb0ea7eaf9c6 SHA-1: dcd08d8d264ba82758de46d2ac242a125cee41dd SHA-256: 7df912b9ce60e0ba68a92398da175152f705bb8c931df67e60c9ebff3d936c7e
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs hosted on file-sharing services, suggesting a link farm for SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests a common tactic of hiding payloads within password-protected archives, with the password provided separately.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://soxebez.ru/award?keyword=calidad+en+salud+definicion+pdf
    • https://xifabaruwene.weebly.com/uploads/1/3/0/9/130969291/kekovu.pdf
    • https://vufepuxo.weebly.com/uploads/1/3/4/5/134522835/3792501.pdf
    • https://jinunezig.weebly.com/uploads/1/3/4/3/134308797/miwej.pdf
    • https://cdn.sqhk.co/dodirorip/boLjeyY/zonulemeliliwulusolumu.pdf
    • https://tixonanixob.weebly.com/uploads/1/3/4/8/134890866/28ec1bee384d7.pdf
    • https://cdn.sqhk.co/kojariwirip/qjhLJkp/88029003287.pdf
    • https://cdn-cms.f-static.net/uploads/4403407/normal_604395bc36a40.pdf
    • https://cdn.sqhk.co/bigulikexupa/ig4jaSl/jalewimukifufok.pdf
    • https://cdn-cms.f-static.net/uploads/4446147/normal_6058b6f7171c4.pdf
    • https://cdn.sqhk.co/fivodewile/hx2hbXg/run_an_empire_mod_apk.pdf
    • https://zupevojug.weebly.com/uploads/1/3/0/7/130740492/jemoriv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://80ce5912-1c67-4773-adf4-abf614566e91.filesusr.com/ugd/acb48a_4cde47fee6a74d3fba24224ededf80e4.pdf?index=true
    • https://83662c7a-80c1-4e94-b5a4-3df479670d58.filesusr.com/ugd/27be29_aa6f13b9dd214de5a2422d7e1333266d.pdf?index=true
    • https://s3.amazonaws.com/vidadaviwal/ejercicios_de_gramatica_en_ingles_basico.pdf
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_5b2a3331c96c458192336999bb7206e1.pdf?index=true
    • https://s3.amazonaws.com/tibanepoxilibud/tajifurixakugisuzi.pdf
    • https://d09251a9-b09e-4077-8ccb-24037f005f7b.filesusr.com/ugd/a6ce17_872e49c392a942c5b42c3166f8b2d8e5.pdf?index=true
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_07ddc8f2a3f54ad6b370e9be23c4ae8b.pdf?index=true
    • https://s3.amazonaws.com/tumuzu/parks_and_rec_episode_scripts.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f435.bin
83eac8123a89b0494f656e03f5e11bee2dc81c01259f1a01760f02af459fff12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF435 4960 bytes
font_01_sfnt_off0001052b.bin
42ec5815142110141ab1a3707adae83250d0746a463ad9b7aaf385b54b63d3b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1052B 11632 bytes
font_02_sfnt_off00012b59.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B59 16204 bytes

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