Malicious PDF — malware analysis report

Static analysis result for SHA-256 17757779f604e4af…

MALICIOUS

PDF

82.5 KB Created: 2021-05-03 17:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a7f967f87f90886fa193fc88f590b640 SHA-1: 74aef73f14f85a19bf62b8a929008e164538a017 SHA-256: 17757779f604e4af3d2bad4d6e2723bfec829cae6395d5cfa2d70c56d3ecad91
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://botokaw.ru/strik?utm_term=ps+i+still+love+u+cast PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417025/normal_5fd0b9c549a17.pdfIn PDF document text
    • https://zoxiniguve.weebly.com/uploads/1/3/4/5/134584112/9835460.pdfIn PDF document text
    • http://dutusejutax.22web.org/play_school_drawing_book.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475383/normal_5fc6c6e576488.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446377/normal_602af59187f6b.pdfIn PDF document text
    • https://gesurori.weebly.com/uploads/1/3/4/3/134353915/9581391.pdfIn PDF document text
    • https://jevefelenop.weebly.com/uploads/1/3/0/7/130775498/88510195f.pdfIn PDF document text
    • http://winemewimivo.22web.org/antigona_prepricano.pdfIn PDF document text
    • https://pegugigatusib.weebly.com/uploads/1/3/4/4/134460290/2095297.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454682/normal_601db112decbe.pdfIn PDF document text
    • https://likerediweraj.weebly.com/uploads/1/3/4/6/134691167/9724464.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://furexuzajob.epizy.com/10045540131.pdfIn PDF document text
    • http://juninowixa.epizy.com/89354289984.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86312f29-c309-4709-9e45-71c4dedf683e/58789351157.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0fc6d80-62f9-4db5-b551-b416b1c5e1f4/dungeons_and_dragons_online_summoner_class.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92bb234d-e225-43ae-9623-192fba1e642d/64678598073.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba865adf-1377-405b-9ca9-f3355951e0b3/gazivokusugejib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a71a1e65-fc76-424b-a909-32c3c046bda3/54423404510.pdfIn PDF document text
    • http://gizimup.epizy.com/34625333595.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36459c71-c3e5-4301-a77f-d6fc690598f2/free_online_spring_framework_training.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5705643b-e92f-4011-9758-4e2d5d9e147a/chaos_theory_in_jurassic_park_book.pdfIn PDF document text
    • http://bukevixu.epizy.com/48511982193.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39d7ef4c-af35-49c7-a502-f85b4b7bbcf2/halo_bassinest_swivel_sleeper_-_premiere_morning_pebble.pdfIn PDF document text
    • http://kudetewususitup.rf.gd/78941412787.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_off000105cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CB 4756 bytes
SHA-256: 6560e73b5adca66091ea897447dcc69228cf276166a40d146df02b995702c1aa
font_01_sfnt_off00011612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11612 11664 bytes
SHA-256: d2ca9b872da32d422f9f29ca12ca49765e8e269d19fc9058f3d8a2f72c99ba65