Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c0ed880b3c842d…

MALICIOUS

PDF

85.9 KB Created: 2021-03-31 01:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 392be8166e097386017f7c1db4737a13 SHA-1: 21e1f3ed751851c98a95a79f2796ee763d9b7ea6 SHA-256: 55c0ed880b3c842dbad284e0caa44a851da4677b949aa1ca33b9c872b91e9595
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the nature of the link farm suggest the document is intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xezojetit.ru/award?keyword=stepper+motor+nema+17+pdf PDF link annotation
    • https://cdn.sqhk.co/vabilafibalu/SIIVLI2/23292456344.pdfIn PDF document text
    • http://devlp.club/44031919285jor3w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474231/normal_602ec72bb9c69.pdfIn PDF document text
    • https://cdn.sqhk.co/tekemozuj/hjqhcji/ropuw.pdfIn PDF document text
    • http://lnstagramverifiedbadgeshelpcenters.net/kanawujuwenulivebojufawebbge59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368493/normal_6037ec7f6c17b.pdfIn PDF document text
    • http://carbags.site/connected_no_internet_android_erroruxyfd.pdfIn PDF document text
    • https://cdn.sqhk.co/ramosigobis/egizkBM/gasozujoxagegab.pdfIn PDF document text
    • http://idealica-it.website/64274086003a54nj.pdfIn PDF document text
    • https://cdn.sqhk.co/wixedineve/jaQUgjk/brain_dots_nivel_214.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487386/normal_6041ace0d6f81.pdfIn PDF document text
    • https://cdn.sqhk.co/tozimozeka/hexOsha/blocky_car_racing_apk_indir_club.pdfIn PDF document text
    • http://smirno.life/male_female_voice_changer_app_for_androidn4k8f.pdfIn PDF document text
    • https://cdn.sqhk.co/wujozuzewed/a1d0Xfo/robert_harris_jr_facebook.pdfIn PDF document text
    • https://cdn.sqhk.co/jenireni/AiEiejc/namijusopusuf.pdfIn PDF document text
    • https://cdn.sqhk.co/setuboluraje/dkHjgXr/pemozonafegevasozidudev.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://510adc33-753b-44c0-977e-8d34da8fcdd4.filesusr.com/ugd/5f4192_48b6a4272ce84a43bb51064dd216cd89.pdf?index=trueIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_5e7dba86453f41d0a1cc52626a4e1432.pdf?index=trueIn PDF document text
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_350d02ebf0b44bc1808a052059b7e3ed.pdf?index=trueIn PDF document text
    • https://9305c775-266c-4126-9ef9-90a5cffee957.filesusr.com/ugd/c3f88d_1224ad6f9fc644d09b0a279072f2c4c9.pdf?index=trueIn PDF document text
    • https://56f9ebfc-1b58-4ccd-90b9-24793863e956.filesusr.com/ugd/0f3536_6858fe94def14d23a43d5661f730128d.pdf?index=trueIn PDF document text
    • https://eee7329a-c4d5-4508-a8fd-a8ba515f7d9f.filesusr.com/ugd/5ed802_20cfc8d574414a328bbe4d012f7db301.pdf?index=trueIn PDF document text
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_0616924e2edc4de38d764a002d865d11.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D1 1528 bytes
SHA-256: 906312b206573a369fdf05f2d58baf7f592464f3d990fc278d772a9a6a9aa3be
font_01_sfnt_off00010a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A97 5212 bytes
SHA-256: d8113757004e703b288d8146895ac128e68dc2465db836289abb27484eed05bd
font_02_sfnt_off00011c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C49 13484 bytes
SHA-256: e9b696571ac669f90b04b8599ca62d14f3e4ea543ff3dbd4bcb2561acebeffb9

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