Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e2463d8f95d7ebe…

MALICIOUS

PDF

96.0 KB Created: 2021-03-17 09:16:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 48affdbef82e7c3e57298903e41705aa SHA-1: d428719f201c635bfd706d93c142934d261f292f SHA-256: 4e2463d8f95d7ebea65aa2157f5c4c84bbea4e700d1fc0b8cbbef97629f46f9a
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or redirector infrastructure, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were extracted, the PDF structure and embedded links are indicative of a phishing lure, potentially leading to a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/award?keyword=apollo+tyres+annual+report+2020+14+pdf In PDF document text
    • http://tasigezagu.scienceontheweb.net/55404543659.pdfIn PDF document text
    • http://wogivodugakovek.mygamesonline.org/winexamesixesamusovo.pdfIn PDF document text
    • https://cdn.sqhk.co/lakuxezaj/hiaJggP/loposuvisuleroxu.pdfIn PDF document text
    • https://cdn.sqhk.co/dutudovajud/gfieijO/pitesumoxuxavubobamos.pdfIn PDF document text
    • http://bekopomulasebi.getenjoyment.net/genie_model_3024_price.pdfIn PDF document text
    • https://cdn.sqhk.co/bivuwusim/e1ii5lf/gakulokuxinobonuninewiwir.pdfIn PDF document text
    • https://cdn.sqhk.co/kurapobal/1TIibe7/58315674536.pdfIn PDF document text
    • https://cdn.sqhk.co/zalopubid/gdgfGjc/orange_happy_day_pen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://powanigidarexo.rf.gd/90633848340.pdfIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_d67407c4315340a19748430fb09f6453.pdf?index=trueIn PDF document text
    • https://5926284e-b61c-4ed0-95e5-27b9feedd2c3.filesusr.com/ugd/50c35f_cb85a26d0c0d4304867dee9df4532caf.pdf?index=trueIn PDF document text
    • http://pawepeg.atwebpages.com/58673670101.pdfIn PDF document text
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_e4b5b708f1fe4be1a28179f078c076bd.pdf?index=trueIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_253b6f32afd5429b927d5c61348782aa.pdf?index=trueIn PDF document text
    • http://kibotiriponikew.rf.gd/where_to_go_after_lavender_town_in_pokemon_red.pdfIn PDF document text
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_9a32e88a893543c390d05553b5975772.pdf?index=trueIn PDF document text
    • https://8c805f22-5240-4a8e-9b4d-8499607ff1fc.filesusr.com/ugd/76156b_c1d8cec909f1468aa1f5bd0242bc7515.pdf?index=trueIn PDF document text
    • https://01477de9-116b-42a6-a62c-54244336611e.filesusr.com/ugd/dea9e9_950077b8ddf84972993e8762df9bbea4.pdf?index=trueIn PDF document text
    • https://01477de9-116b-42a6-a62c-54244336611e.filesusr.com/ugd/dea9e9_bf4e5fabb40b445d917b5ace2fb8ac02.pdf?index=trueIn PDF document text
    • http://vimixof.onlinewebshop.net/how_do_you_know_if_your_flame_sensor_is_bad.pdfIn 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_off000138e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E7 5540 bytes
SHA-256: c2e101e05b8a3f94ebd48e6056f481431f1cc4156866e946969b1ee4ac91b73b
font_01_sfnt_off00014bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BDD 11516 bytes
SHA-256: 9654460c5050fa7bb41eb4024f54c1f52ec87118bdcbb136872a2c47742a9cd7