Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b21c1d24e4383e…

MALICIOUS

PDF

80.5 KB Created: 2021-04-03 11:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 088acbbcb753cd6270f2818cd4bb92e7 SHA-1: 7e8bc8ec657ddfdeaebab8acbf1dc49e8b45ad4e SHA-256: 20b21c1d24e4383ec5cf909d6c82ee0ea2779a200a76bd1d0761713cb9057978
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a "PDF_SEO_LINK_FARM" heuristic. One of these links points to "https://jacksth.ru/aws?utm_term=air+force+1+shadow+pink", which is likely a malicious redirection or phishing lure. The ClamAV detection and ML classifier also indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • 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://jacksth.ru/aws?utm_term=air+force+1+shadow+pink PDF link annotation
    • https://cdn.sqhk.co/muwanije/jihjF9p/2k20_helicopter_entrance.pdfIn PDF document text
    • https://cdn.sqhk.co/nomuzali/gcyibjc/flagstone_patio_with_firepit.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabalero/LOjjLwX/wwe_network_app_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/SBijphd/89918793907.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/51073836125.pdfIn PDF document text
    • http://jenuxijaf.mygamesonline.org/67132132770.pdfIn PDF document text
    • http://mupokufakub.iblogger.org/american_heart_association_bls_for_healthcare_providers_student_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/bhagavathi_movie_1080p_hd_video_songs.pdfIn PDF document text
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_a3c66006ffc9448cb05aefc88ad22939.pdf?index=trueIn PDF document text
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_7f1fd882cfc04df89932d51da90e91b2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/37019636198.pdfIn PDF document text
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_ea070e3f3d5643bfa308dbaefa8174da.pdf?index=trueIn PDF document text
    • https://75e6d08a-b14f-4c2c-bd4e-3e6431d9d11c.filesusr.com/ugd/497a87_9f4e3695665548e99ba3a7e232590c35.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woxorojero/splash_screen_animation_in_android.pdfIn PDF document text
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_a578ab39026c481ab495bee06fa6d19c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/seriposuj/22153851167.pdfIn PDF document text
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_a2eb33689074419490c0d9012f9ee1bf.pdf?index=trueIn PDF document text
    • http://sodowurivav.onlinewebshop.net/americanismo_e_fordismo_gramsci.pdfIn PDF document text
    • https://18bc7be3-897e-46c1-a475-efc190d089bd.filesusr.com/ugd/62845f_8d5b84f385e449e39d0beed350581aac.pdf?index=trueIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_d56e773f82c642cc807bf12b80285f0d.pdf?index=trueIn PDF document text
    • http://miwewugewu.atwebpages.com/25807396765.pdfIn PDF document text
    • http://kifilexaxinazer.epizy.com/xaluzadiwariz.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/81700237824.pdfIn PDF document text
    • http://sakedasapivo.epizy.com/cal_state_fullerton_map.pdfIn PDF document text
    • https://e9b66cc5-9289-431c-8f17-6739e1cd2d88.filesusr.com/ugd/c8f33b_3bac36a802e748ed98f87a02057501ba.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD1 5408 bytes
SHA-256: 7f2a32589070e5adf25415a304f20f8c674388e68cacba17f24ab7a2d907ab67
font_01_sfnt_off0001104f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104F 10836 bytes
SHA-256: 0b047ac17df0d20532990f02d7f807bf349d87dd66610d0632addab7edd402ce

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