Malicious PDF — malware analysis report

Static analysis result for SHA-256 835cc1089e6a2a86…

MALICIOUS

PDF

76.3 KB Created: 2021-02-16 12:42:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d780e1dad8e558dfd9dd3ebace3a5c0b SHA-1: 18fc6521fef40ad8a8de5e5f67ecadd3b17e5c99 SHA-256: 835cc1089e6a2a8642f409ecf32f6ea7900533b6af22553fa448c825d9f4d1eb
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of embedded links, many pointing to redirector infrastructure and a link farm, suggesting an attempt to direct users to malicious sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing or trojan distribution intent. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wb?keyword=how%20much%20does%20it%20cost%20to%20repair%20charging%20port%20iphone In PDF document text
    • https://kelogukagikuval.weebly.com/uploads/1/3/0/7/130739039/xalelonuwupefetefi.pdfIn PDF document text
    • https://lugoponogib.weebly.com/uploads/1/3/4/4/134404253/sikuti.pdfIn PDF document text
    • https://melukibe.weebly.com/uploads/1/3/0/8/130873851/rikesudotaxuzov.pdfIn PDF document text
    • https://kagoxikefo.weebly.com/uploads/1/3/4/6/134649289/gikesopuz-rusujokaf-wadarino-nojalugu.pdfIn PDF document text
    • https://cdn.sqhk.co/woguwubege/gchd5fs/33238400344.pdfIn PDF document text
    • https://vebaxifi.weebly.com/uploads/1/3/4/3/134360040/839ec9.pdfIn PDF document text
    • https://sutoxozugunewu.weebly.com/uploads/1/3/4/7/134768558/zedizedenura.pdfIn PDF document text
    • https://severuzilun.weebly.com/uploads/1/3/4/7/134710190/1eac63f.pdfIn PDF document text
    • https://cdn.sqhk.co/tikisudolo/3OdSceJ/donuts_drift_car_driving.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/baposivarabuj/wubojajuxa.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/56261902241.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/26783651114.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/viwagebexo.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/96145153307.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/inventory_balance_sheet_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/26003023973.pdfIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/bike_game_free_uptodown.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_off0000eb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9A 5508 bytes
SHA-256: 9ca083a222c961c5cd8aa0136b0271d95991b9a435982f5d30805adaf656a983
font_01_sfnt_off0000fe39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE39 11136 bytes
SHA-256: 52deeac6d0b55661ce849bcd87da1c5011d77100a9ce8ebe0b48e847cfe58af7

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