Malicious PDF — malware analysis report

Static analysis result for SHA-256 480baf7cc64dc600…

MALICIOUS

PDF

72.1 KB Created: 2021-03-09 10:00:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 451dbd7bcc2dbdcc82e835577a93d937 SHA-1: 28eca23453ac556df13beb0c164d37dbf3718a49 SHA-256: 480baf7cc64dc60070baa83bb0fd8e280b0ee7937847614da12acdf6367b4f19
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly and other hosting services, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/award?keyword=verb+to+be+affirmative+negative+interrogative+exercises+pdf
    • https://wabezapodila.weebly.com/uploads/1/3/1/4/131437306/tiwomo.pdf
    • https://biluvumilu.weebly.com/uploads/1/3/1/8/131860938/6697017.pdf
    • https://cdn.sqhk.co/fufitefan/gihicj1/toca_life_town_ios_download.pdf
    • https://cdn.sqhk.co/kinibemazoz/Nlf1hdQ/heroes_legend_idle_battle_war_best_heroes.pdf
    • https://naruvemekojesez.weebly.com/uploads/1/3/4/6/134685524/virulibixej.pdf
    • https://mabobuloxulekev.weebly.com/uploads/1/3/4/6/134692970/9699842.pdf
    • https://cdn-cms.f-static.net/uploads/4466166/normal_601013d4dfa4e.pdf
    • https://cdn.sqhk.co/vipabure/if26rgd/bucket_list_things_to_do_in_the_us.pdf
    • https://cdn.sqhk.co/kewesowovim/34ylCia/half_ball_balance_board.pdf
    • https://cdn.sqhk.co/mepowokugo/ifRBgdq/35559684347.pdf
    • https://cdn-cms.f-static.net/uploads/4482228/normal_604167788e55f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1428d2fd-425c-4df9-bf00-fb1cffbd3eb4/mozuzazobavut.pdf
    • https://s3.amazonaws.com/jinabom/pugukor.pdf
    • https://s3.amazonaws.com/nijosinizo/sozeradimafet.pdf
    • https://uploads.strikinglycdn.com/files/9c01d95a-d432-476e-8d23-94c3896a172e/36503625090.pdf
    • https://uploads.strikinglycdn.com/files/468e07eb-b703-4312-baa3-59f57655be14/american_journey_dog_food_feeding_guide.pdf
    • https://s3.amazonaws.com/xuzed/type_1_and_type_2_chiari_malformations.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_off0000db52.bin
a40c03f9eafcd75850d7c47136e7b32e905b4ba04861719245b7deb597b346f8
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB52 5676 bytes
font_01_sfnt_off0000ee9a.bin
01620640668f4a96aa18c2648f3e7f37c89fc25cec3d0026c5be46e7e3547165
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9A 10640 bytes