Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b3f8ca70889efb5…

MALICIOUS

PDF

85.9 KB Created: 2021-03-24 09:04:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f11c0ff60b8ba359dc032acb3999b3d SHA-1: 90cbad27e03ba0f1969da2e7cdea58273ede7e86 SHA-256: 1b3f8ca70889efb5ef00f574395711f66af80d9bb1e3911249557fb8c762789d
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms and phishing sites. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, with one pointing to a suspicious domain (crophysi.ru). The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://crophysi.ru/strik?utm_term=persuasive+essay+prompts+for+middle+school
    • https://zinibikilejob.weebly.com/uploads/1/3/4/8/134886520/gitotesepop-zomalufesor-gowuvojoxi.pdf
    • https://cdn.sqhk.co/damukowabij/jiixeig/free_hearts_app_for_ipad_calculator.pdf
    • http://rubeatyshop.xyz/43861728711kfh38.pdf
    • https://cdn.sqhk.co/labifikup/fjcpuLN/4703749959.pdf
    • https://tazerodine.weebly.com/uploads/1/3/4/5/134598813/bilim.pdf
    • http://reduslimitaly-ufficiale.site/vavajodanwahxz.pdf
    • http://cookwellbakewell.com/20441144237efw31.pdf
    • https://cdn.sqhk.co/mutexeze/hijcrif/how_to_draw_a_cartoon_eyes.pdf
    • http://setofexperience.site/amelia_bedelia_first_day_of_schoolnmhh0.pdf
    • https://xonovezalewame.weebly.com/uploads/1/3/4/4/134489084/916c6232bd444.pdf
    • https://soxiwavarado.weebly.com/uploads/1/3/1/4/131437421/9738782.pdf
    • https://favapebunekef.weebly.com/uploads/1/3/0/8/130874429/nakenopozuzozanod.pdf
    • http://bullbananavannaone.xyz/21852030448q9zba.pdf
    • https://wiruwopifezub.weebly.com/uploads/1/3/4/3/134345133/5c65a2bd3f74.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ba85394b-11ac-4ca4-926b-74ca936c52e1.filesusr.com/ugd/5ccfc8_ae8f805f1f114d358ad8ddc86e0ae0fe.pdf?index=true
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_5b78a998829b4df887a4497b5b689391.pdf?index=true
    • https://3568ea06-17fa-4787-91ae-86b9aa918cbd.filesusr.com/ugd/8ade13_d281c20e0b53452092d97867b404464c.pdf?index=true
    • https://689a2394-1721-4ce0-b6f7-af9f1dc0d621.filesusr.com/ugd/0f5b72_1aa95bca7a834451b905273481ff465f.pdf?index=true
    • https://2a26c5f8-c4f8-4af8-830b-7e2c9961bd8e.filesusr.com/ugd/2e4362_304dc5de283f4351ba2ad3c9cb9fcfed.pdf?index=true
    • https://3778afa4-e5d9-4bb6-be54-d343c89b577b.filesusr.com/ugd/11c894_90ffb62b21e7487f80cdc283aae79fa2.pdf?index=true
    • https://53860ffb-5975-4088-b838-5c82367c2827.filesusr.com/ugd/0d2908_702c8b351dfb4ebc835f730c6dc9066c.pdf?index=true
    • https://b23ebcb4-2e41-4c68-a408-584c84124782.filesusr.com/ugd/5a2446_bad3029abae847f99ae8255b84eb956e.pdf?index=true
    • https://f1c0478e-57b3-422a-b8eb-433964b677d2.filesusr.com/ugd/16c17d_af1c35d8ca314d349e7e1017aefecc6d.pdf?index=true
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_0661134ebf6b4ba1925847136678a6f4.pdf?index=true
    • 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_off00011228.bin
46128c3bbcd58419633e1563d3c82ea02562df289181370d386067bcd1fdf895		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11228 5560 bytes
font_01_sfnt_off000124f5.bin
de4214170c297a1c64dea8ccb399d605e11a7b7b292a88f6d61705e50be50ec0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124F5 10900 bytes

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