Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff2899f35b6eff28…

MALICIOUS

PDF

73.5 KB Created: 2021-01-31 07:42:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 67d634131be538d08c596d3f75e9736f SHA-1: 623e021392f3cfec8b3f1163cfd227b1376bf342 SHA-256: ff2899f35b6eff28efdda89ea84adab8498f840c29a7f51c00eabfbb02ba4d27
252 Risk Score

Malware Insights

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

This PDF document contains numerous links, many pointing to disposable hosting and redirector infrastructure, indicating a link farm designed to distribute malicious content. The presence of a 'download button' lure and a critical heuristic firing for malicious redirector links strongly suggests a phishing or malware distribution attempt. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely leading to a phishing page or a second-stage payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ggtraff.ru/wb?keyword=cartoon%20comic%20strip%20maker%20apk In PDF document text
    • https://cdn.sqhk.co/leredupodeka/oregiic/senajuvodukavulezemusax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484358/normal_5ff12aa69def6.pdfIn PDF document text
    • https://mokoluwi.weebly.com/uploads/1/3/4/5/134595511/4a172832.pdfIn PDF document text
    • https://karopudalel.weebly.com/uploads/1/3/4/8/134881347/9f82dd33788.pdfIn PDF document text
    • https://cdn.sqhk.co/lazaxosu/6hcihj3/vobomemevoxafugupime.pdfIn PDF document text
    • https://zasuzepomuban.weebly.com/uploads/1/3/4/6/134627511/kifamufine.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449998/normal_5fec13311be3a.pdfIn PDF document text
    • https://cdn.sqhk.co/ninivaxibab/hhBXuYq/chocolaterie_stam_locations.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392472/normal_5fda913e1afb3.pdfIn PDF document text
    • https://cdn.sqhk.co/togokitaz/dyjgjdV/free_mobile_radar_detector.pdfIn PDF document text
    • http://cleaner360.shop/162491784236zvp3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501794/normal_60108c910cc50.pdfIn PDF document text
    • https://cdn.sqhk.co/gukisafuw/igjjcjd/busotusubedabalezaleru.pdfIn PDF document text
    • https://jotogenawe.weebly.com/uploads/1/3/1/4/131406354/1789868.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vofadoloves/free_lagu_joan_baez_donna_donna.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/basic_cover_letter_template_uk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD533 4920 bytes
SHA-256: 5b2c7520a6a23ce2380c1cb71a5c3012ae83be1c69d63cd344ede15874dbb1ca
font_01_sfnt_off0000e5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D1 10824 bytes
SHA-256: cff93466e7c1834a6044f96c0cedb468bc95da6148af1d24cb5fc1a57ee30945
font_02_sfnt_off00010ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADE 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333