Malicious PDF — malware analysis report

Static analysis result for SHA-256 f32fa45523dc9489…

MALICIOUS

PDF

76.0 KB Created: 2021-05-02 13:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 898739ec72400da26f31c99b0af34886 SHA-1: 243d3b29078478bd4d28db2bd3df73ecaa42f61b SHA-256: f32fa45523dc94894c203ee187782929d254cb13ca542a23abe25c3c6b1d1593
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The ClamAV detection and ML classifier further indicate malicious intent, specifically classifying it as a phishing trojan. While no scripts were extracted, the presence of embedded links and the nature of the heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • 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://yafferge.ru/strik?utm_term=golfbuddy+voice+2+battery+replacement In PDF document text
    • https://cdn.sqhk.co/bosamame/zZLigxx/63990562371.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379844/normal_6062235ca3226.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369904/normal_6036c8fc45ae9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405660/normal_60367b1674768.pdfIn PDF document text
    • https://cdn.sqhk.co/boxepupovemu/dtifXjg/word_cookies_bake_off.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416669/normal_5fe5647fcc5c3.pdfIn PDF document text
    • https://cdn.sqhk.co/palezubifo/bew7ifz/donukanuvise.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412890/normal_601f99850121e.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/kudufigunabi/9659760640.pdfIn PDF document text
    • https://fa90eb46-aa9b-4fd1-a2e8-e903ec8e50a4.filesusr.com/ugd/575fb0_802d53b90f034ce4901dd69284ac568a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tiduro/marine_corps_weight_loss_program.pdfIn PDF document text
    • https://e8ceee85-86bf-4804-80ab-d7a1511cbcf5.filesusr.com/ugd/38650a_ddd61572c4de4ae7bd0cd13a6e9c27ed.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sisaxu/46412125914.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/xonukifoxerurupi.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/how_to_improve_analytical_skills.pdfIn PDF document text
    • https://s3.amazonaws.com/waduzirader/balak_palak_movie_free_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/slingbox_500_remote_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/biwerofininefagos.pdfIn PDF document text
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_73218bb79c8c4ddb95e9079c84a8e715.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/putelekireza/mejotavagifiliwizodi.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/mupap.pdfIn PDF document text
    • https://s3.amazonaws.com/tafogusegabomu/wakirikunakorogepax.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/what_is_the_holy_book_of_the_islamic_religion.pdfIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_128cd5edc54a461ebb116eb9c004f14f.pdf?index=trueIn 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_off0000ea70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA70 5588 bytes
SHA-256: d04df64283b975235f1e150ec0bbe951596fb36023804c955d29fa1a2ad911ec
font_01_sfnt_off0000fd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6D 10796 bytes
SHA-256: 2a0df730aa2bc3b3bb13f992627f3fc7b6bdd098e56dcd67c298c16cac5e3a0c