Malicious PDF — malware analysis report

Static analysis result for SHA-256 39b4a907d0624724…

MALICIOUS

PDF

80.4 KB Created: 2021-03-15 03:12:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1f05f427d11632c5175c49b55e8de3f8 SHA-1: 78bef3f1ed36e4022a95db5c33484900b61ebe76 SHA-256: 39b4a907d062472436af162dce1d2904f43e8407b0bf4f8eb9786f53bdd0fcb4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are hosted on suspicious domains, indicating a link farm or phishing attempt. The heuristic PDF_SEO_LINK_FARM and the presence of many unknown reputation URLs strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://jumiwimov.ru/strik?utm_term=traductor+de+textos+espa%25C3%25B1ol+ingles+gratis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4502245/normal_5fe96fb984ac5.pdfIn PDF document text
    • https://cdn.sqhk.co/josipinu/c9Fhnig/nagamupu.pdfIn PDF document text
    • http://hellochildren.online/lessee_information_sheet_subsequent_filing78rvx.pdfIn PDF document text
    • https://xinofebew.weebly.com/uploads/1/3/5/3/135305957/7760435.pdfIn PDF document text
    • https://tupunatuluzike.weebly.com/uploads/1/3/1/3/131383671/28436e90e7f84db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375705/normal_5fec1b45cb0e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374956/normal_6047d5672df63.pdfIn PDF document text
    • https://besajiti.weebly.com/uploads/1/3/1/8/131856076/livanaxedaxidaz_novigabobare_verizitob_vipirip.pdfIn PDF document text
    • http://montana-media.com/who_died_in_the_crown_season_3_episode_15cdr2.pdfIn PDF document text
    • http://experiment.website/battleship_blitz_mod_apkouejy.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/jhhidgi/51299049926.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481278/normal_6021a564f28d9.pdfIn PDF document text
    • https://cdn.sqhk.co/zifiguwosu/gdghrhd/subterfuge_definition_francais.pdfIn PDF document text
    • https://cdn.sqhk.co/luridixajix/W1ujhgf/85955363228.pdfIn PDF document text
    • http://smotrikino.fun/finoboxaamue6.pdfIn PDF document text
    • https://cdn.sqhk.co/zupisopad/jhhfRqV/7167681940.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416501/normal_5fff7f9fc2bcb.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/legobegutulo/4294701253.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/harry_potter_books_for_sale_gumtree.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/56282544111.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/diloramuzujojuvolevivo.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/pdf_gametogenesis_pada_manusia.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/tuvipileremev.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/bharti_axa_life_insurance_plan.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_off0000ea51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA51 5352 bytes
SHA-256: e41f168c9a2c1effd5b6ab06f631c585e37ec87e07df3a6ef9024dce7d053c89
font_01_sfnt_off0000fc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4B 12228 bytes
SHA-256: 2500cc0dd7d7339d2a995a1487e3394315a51fd4f5ef3a28ed02a045ecbbce46
font_02_sfnt_off000123a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A4 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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