Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef53ace9324890c…

MALICIOUS

PDF

69.7 KB Created: 2020-12-06 17:46:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c1a53cbd8e916bfbf2abbc2d3911f304 SHA-1: 13bc512c7141d9a2ea4d829c16f51a1479f95af1 SHA-256: 5ef53ace9324890cfa272a367d3f2cea07f5bb64e59dc32efc8b4c079f5fe3a0
244 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, many of which point to disposable hosting services and redirector domains, indicating a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or SEO manipulation attack.

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://ggtraff.ru/strik?utm_term=ge+lavadora+wcre6270d0ww+manual+pdf In PDF document text
    • https://sakifawabepufa.weebly.com/uploads/1/3/4/4/134466371/vobejonabal-guzabux-kugiroxaxane.pdfIn PDF document text
    • https://daluwora.weebly.com/uploads/1/3/4/3/134319963/e3473616d8.pdfIn PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/242547.pdfIn PDF document text
    • https://tejigenunonim.weebly.com/uploads/1/3/0/8/130813632/vodumalupelakeg-balefavanixomaf-laxumoxetitab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365560/normal_5f871ef0dd288.pdfIn PDF document text
    • https://kirugivedipabaw.weebly.com/uploads/1/3/4/4/134464293/db3078fdf5.pdfIn PDF document text
    • https://fukobararusi.weebly.com/uploads/1/3/4/4/134404541/magisipifumenim_nesiki_vilaxirug_pilujobinuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369920/normal_5f8c64d52b58c.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/ab714b6b-87bf-469b-bd0b-14801348599a/fallout_shelter_weapons_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb0dd3f7-ffb9-42fb-8eb8-8e6727d5f2af/van_wezel_sarasota_florida_seating_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96f39162-c230-465c-9c2d-5ea57edaae15/technical_support_engineer_interview_questions_and_answers_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/1917512702.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_off0000cf23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF23 5816 bytes
SHA-256: b43ebc246a748fbce6fb85af4510af9a272abc3cd57516d2eff7e567e11ea11c
font_01_sfnt_off0000e302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE302 10896 bytes
SHA-256: 91c86150c16df15ad8cb6cf8a31e61bc6e000536ac0feef837eadce2e1cb34ef

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