Malicious PDF — malware analysis report

Static analysis result for SHA-256 24f369d4907ee7e1…

MALICIOUS

PDF

69.2 KB Created: 2021-02-18 01:04:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c7efed705835ce72bf5aaf4fbf7b25ee SHA-1: 440b971aec021221bbb5d1c00b478067ba345487 SHA-256: 24f369d4907ee7e139f5a2ac856b2d25b84d1263e8e3a53f5194e1814e3c75ac
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains and redirectors, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://crophysi.ru/123?utm_term=stress+management+questionnaire+for+teachers+pdf In PDF document text
    • https://cdn.sqhk.co/zogowefu/egdNRxE/9394365837.pdfIn PDF document text
    • https://cdn.sqhk.co/lilokimoz/bXR0Ehi/49030267225.pdfIn PDF document text
    • https://sisuwupuwadigif.weebly.com/uploads/1/3/1/4/131437471/4294434.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496013/normal_5fdeeaa95788d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411701/normal_601a86e24a50e.pdfIn PDF document text
    • https://cdn.sqhk.co/depifozopupe/5hjnwVf/spyro_ripto_s_rage_metro_speedway_orb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443824/normal_5fdeb1666c2a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446492/normal_5fe8b2ead8d66.pdfIn PDF document text
    • https://cdn.sqhk.co/fafujedajir/lhdghiq/formula_racer_game_hacked.pdfIn PDF document text
    • https://cdn.sqhk.co/bijininabex/eggewgi/origami_heart_instructions_dollar_bill.pdfIn PDF document text
    • http://nalomojup.22web.org/graphing_exponential_functions_using_transformations_worksheet.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
    • http://xegeduv.rf.gd/wogasegebu.pdfIn PDF document text
    • http://bezegorev.epizy.com/avolites_titan_11._1_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/famisefox.pdfIn PDF document text
    • http://rodaselawowov.rf.gd/23860951843.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_off0000c419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC419 5648 bytes
SHA-256: 05ca79a7cc0219dee5c9fc77ed0035d314dcaa3d77ecb7a60619973a066dc0dd
font_01_sfnt_off0000d706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD706 10060 bytes
SHA-256: f62e59f074bc70541fe599f16d05b18c4a6f8c00bf36fe38844a6b8baab1706e
font_02_sfnt_off0000f94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94C 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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