Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e445812053c890f…

MALICIOUS

PDF

70.6 KB Created: 2021-02-21 23:04:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d0b49072bf09c44f3b434358cd81e8ea SHA-1: 3e00ffb76b97b0cd7ef5285b807e41621e1b2c0e SHA-256: 1e445812053c890f97aaa298a1d3e08a9d81b064926c71fe41d2fabf6c84584f
184 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to disposable hosting and redirectors associated with malicious activity. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's high confidence score suggest a phishing or redirection attempt, likely intended to deliver a secondary payload or lead the user to a credential harvesting page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=cards+against+humanity+online+free+zoom In PDF document text
    • https://cdn.sqhk.co/komajekolino/siaDpji/digestion_medical_term_suffix.pdfIn PDF document text
    • https://revijokatise.weebly.com/uploads/1/3/3/9/133999222/98d4646c0b2b581.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474176/normal_6008d2bf1a2b9.pdfIn PDF document text
    • https://cdn.sqhk.co/komajekolino/gghaLhf/power_starz_ghost_and_tasha.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445868/normal_5fea0bb6580bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427506/normal_5fe4919f9f599.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461770/normal_601a999e630d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409811/normal_5fee1d9c7f93a.pdfIn PDF document text
    • https://wuwepila.weebly.com/uploads/1/3/4/3/134371533/542366.pdfIn PDF document text
    • https://vuxutuwatojo.weebly.com/uploads/1/3/4/6/134625262/5540888.pdfIn PDF document text
    • https://kemiponoza.weebly.com/uploads/1/3/4/6/134605011/e42dba.pdfIn PDF document text
    • https://dipalowijoje.weebly.com/uploads/1/3/0/9/130969855/200022.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374689/normal_601c5dd804745.pdfIn PDF document text
    • https://cdn.sqhk.co/wirubetena/idieexw/realistic_balloon_dog_drawing.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zidenigad/cyanobacteria_nitrogen_fixation.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/64525080290.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/canada_work_permit_online_application_form.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_off0000d681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD681 5380 bytes
SHA-256: 2b9947f7f46952658e38565abe33176a31115b3ec4d1baa75d6655e0fcada2dc
font_01_sfnt_off0000e8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AD 10832 bytes
SHA-256: d7a085561c25e0629d8bf2e4e9197af08cfe28677184323484f7ca79c5b41117

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