Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6083b6c1e687861…

MALICIOUS

PDF

74.6 KB Created: 2021-06-08 16:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 175a4384d2682e2728a9962968fab591 SHA-1: 22e475fc301136bc78e9dbca57b25ecda1c4a76a SHA-256: d6083b6c1e6878612717e1069dadb4047c4fe90200281f6a785f08deeb21a2f8
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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.
  • 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://catamma.ru/pbw?utm_term=comrade+in+america+movie+download+with+english+subtitles+%253B+500+%253B++%253B++%253B+Low+%253B+0 PDF link annotation
    • https://nusavudusegi.weebly.com/uploads/1/3/4/4/134444144/7506960.pdfIn PDF document text
    • https://putesoborufo.weebly.com/uploads/1/3/0/8/130814126/e7bdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471514/normal_6052e85b20296.pdfIn PDF document text
    • https://zanijiwudiv.weebly.com/uploads/1/3/5/3/135349447/5eefbf5e3a167.pdfIn PDF document text
    • https://semizafug.weebly.com/uploads/1/3/1/8/131871859/9841856.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451927/normal_60443ac03a0e5.pdfIn PDF document text
    • https://tofikopu.weebly.com/uploads/1/3/1/3/131381225/zanowejoluwijiku.pdfIn PDF document text
    • https://mavusuwavonim.weebly.com/uploads/1/3/4/4/134493404/302198.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426407/normal_5ff1e5ddc062a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415052/normal_5fd78293b6e97.pdfIn PDF document text
    • https://nateguwab.weebly.com/uploads/1/3/1/4/131453796/funiwenasakati.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481821/normal_601340564c864.pdfIn PDF document text
    • https://musagitunoton.weebly.com/uploads/1/3/4/3/134368320/1031747.pdfIn PDF document text
    • https://daxozeke.weebly.com/uploads/1/3/4/3/134322415/e08b43ec.pdfIn PDF document text
    • https://zatozidebowetam.weebly.com/uploads/1/3/1/3/131398213/kamufakirawerov.pdfIn PDF document text
    • https://xotizirew.weebly.com/uploads/1/3/1/8/131855992/486894.pdfIn PDF document text
    • https://golamusexa.weebly.com/uploads/1/3/1/6/131606818/jiwipasofes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sikawejedi.pbworks.com/f/sikininasusipagixotupovu.pdfIn PDF document text
    • http://tazijebep.pbworks.com/w/file/fetch/144420888/tasen.pdfIn PDF document text
    • http://xodelow.pbworks.com/w/file/fetch/144453162/laboratory_experiments_in_chemistry_for_health_professionals.pdfIn PDF document text
    • http://tazijebep.pbworks.com/f/81031082013.pdfIn PDF document text
    • http://fuxotatizexu.pbworks.com/w/file/fetch/144720501/can_you_still_subscribe_with_twitch_prime.pdfIn PDF document text
    • http://tubekikewabi.pbworks.com/w/file/fetch/144646686/xunubev.pdfIn PDF document text
    • http://nadisizaze.pbworks.com/w/file/fetch/144702915/exagear_windows_emulator_apk_obb_revdl.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_off0000e380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE380 5920 bytes
SHA-256: 84668789c7f71fb06a2a07e476336f435165db68161707bdf9d24143297075a2
font_01_sfnt_off0000f7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A1 10836 bytes
SHA-256: c4c8d9f484822ec18ca680f0ff4686e70d9a65d7e9e2b56f2223e87a6f4e743a