Malicious PDF — malware analysis report

Static analysis result for SHA-256 49181783ffcf1e77…

MALICIOUS

PDF

82.3 KB Created: 2021-03-14 18:40:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 24457271c1e5c76da73a76a3ae957da9 SHA-1: dbb4ae018f2cef5802f8a17e75b88f0a27d51aa1 SHA-256: 49181783ffcf1e77d979eef551925c1be4d9260ee38c9b5afe31b372b109ded2
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirectors, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a social engineering attack designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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/123?utm_term=cascading+goals+performance+management In PDF document text
    • https://static.s123-cdn-static.com/uploads/4412591/normal_5feb1b06c6eeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485308/normal_6001e501a5e18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490934/normal_6037d67a0bd08.pdfIn PDF document text
    • http://menformula.xyz/futavewebajfufq4.pdfIn PDF document text
    • http://medicinfo.online/kekuwilkt2rl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377656/normal_604d89477d277.pdfIn PDF document text
    • http://nicechange.space/ford_ranger_4.0_v6_towing_capacityclmm5.pdfIn PDF document text
    • http://heretythere.site/21349116901pe9vw.pdfIn PDF document text
    • http://fortuneo.biz/feduxipijadosabidxiqg.pdfIn PDF document text
    • http://look-hotel.com/fatevosopowozebuluvuxom4g788.pdfIn PDF document text
    • http://repochka.site/buvevefixeto6k8f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471467/normal_60243e1338458.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ec8f2fd-c58c-4d4e-9ada-9edf09ac73e0/xuwusewivofu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/063a1aec-e193-4311-b8b3-22e50314a112/sibananonineje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/513c7230-ff35-4ad0-9886-21a86a19f171/upcoming_makeup_releases_2020_fall.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d32fbd2-f8d9-4a25-a375-a536b847d70c/river_flows_in_you_piano_long_version.pdfIn PDF document text
    • http://wilesodirax.epizy.com/xuluxufenamamive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b3b3443-b86d-49a5-83c6-9c544bec79d1/why_picric_acid_is_a_strong_acid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/012236bd-63d2-4b78-ace1-54e01c26725a/38878359251.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cab347a-a439-4834-a97f-ff8c7df46c12/56245791179.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5575a8ee-af0e-472e-afa2-ede6d0042bf5/text_structure_examples_in_literature.pdfIn PDF document text
    • http://sajobovu.epizy.com/pdf_to_word_editor_online_free.pdfIn PDF document text
    • http://suzusufiwavel.rf.gd/72014248187.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_off000104cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CD 5380 bytes
SHA-256: 5d94a8df5f4b5fb8ea4a79daf4e8bd5bb1f0809a69d3e4d870d4603c59c0f543
font_01_sfnt_off00011700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11700 10716 bytes
SHA-256: d34277cfca47b6fef20d61821390677f0e0e59f0b8ab77f79184e0aaa08800c3