Malicious PDF — malware analysis report

Static analysis result for SHA-256 9066adab289d89c7…

MALICIOUS

PDF

86.0 KB Created: 2021-05-25 12:41:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b283dfd98a492d2808c3b03123381171 SHA-1: 5632c43b22022bb9898fb80357d92c4fc4a7d007 SHA-256: 9066adab289d89c76e3f001ea15618ef062762e64982917a276bfac536790d0f
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'https://yafferge.ru/strik?utm_term=tw+facebook+lite+gold+latest+version+apk+download'. Additionally, it exhibits a PDF link farm heuristic with numerous external PDF links, suggesting a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=tw+facebook+lite+gold+latest+version+apk+download In PDF document text
    • https://static.s123-cdn-static.com/uploads/4410976/normal_5fec8c7d2298f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446390/normal_60226e7874623.pdfIn PDF document text
    • https://xoxudepibedewem.weebly.com/uploads/1/3/5/3/135317482/didujupabuzurenajir.pdfIn PDF document text
    • https://tivexafo.weebly.com/uploads/1/3/4/3/134348633/1684d589.pdfIn PDF document text
    • https://jowatewiko.weebly.com/uploads/1/3/1/3/131380225/7642481.pdfIn PDF document text
    • https://xutorobufazam.weebly.com/uploads/1/3/5/3/135345650/bbd87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385437/normal_5fcf3e361fd14.pdfIn PDF document text
    • https://fugesozuxi.weebly.com/uploads/1/3/0/7/130739141/detileleva-milibol-gezojotanerojob.pdfIn PDF document text
    • https://kukezuleji.weebly.com/uploads/1/3/4/3/134361302/2461794.pdfIn PDF document text
    • https://lofusomibebez.weebly.com/uploads/1/3/2/7/132740423/nimoruza.pdfIn PDF document text
    • https://jotajawe.weebly.com/uploads/1/3/1/6/131606146/nanufuso.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/telasebisu/37758348596.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/wheel_horse_520h_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/the_crucible_act_1_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fe89675-d837-4ee1-b623-e94ac20668d5/venikabunirivisavekonosu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbd3bd5a-1b4d-430e-b0cd-87f6b015a13a/pagop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8056bcbd-8aca-4326-b4c4-93a8bd64f432/42391492166.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2e497a5-bc6d-4d12-a8ab-0fb9ca79feca/40625220419.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/17128496704.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23038dd7-e791-4110-b84d-482cb4434754/somewhere_over_the_rainbow_chords_in_c_major.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02bc4428-5be1-432f-9fdb-59361e0c465f/tefavitodinuji.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/casio_privia_px-320_price.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_off000110d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D9 5628 bytes
SHA-256: 52e66fab2cfeac6f1ee21e71e24ea0231f6ad606d63465dc467a52572620b682
font_01_sfnt_off00012422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12422 10644 bytes
SHA-256: 7f748527a9d8dd91ba4d3663f8e4ce8fd65e128682c4e93f01720965d51e47b9